diff --git a/.gitignore b/.gitignore
index d82160d5242..1afb24e8405 100644
--- a/.gitignore
+++ b/.gitignore
@@ -54,6 +54,14 @@ pubspec.lock
 # Vim temporary swap files.
 *.swp
 
+# Third party files
+third_party/nss_pkcs12
+third_party/polymer
+
 # Generated files.
 tools/out
 tools/xcodebuild
+pkg/shadow_dom/tool/node_modules
+
+
+
diff --git a/pkg/shadow_dom/lib/shadow_dom.debug.js b/pkg/shadow_dom/lib/shadow_dom.debug.js
index 4ea1ab833ae..eff86b3e6c2 100644
--- a/pkg/shadow_dom/lib/shadow_dom.debug.js
+++ b/pkg/shadow_dom/lib/shadow_dom.debug.js
@@ -3204,4 +3204,528 @@ var ShadowDOMPolyfill = {};
   };
 })();
 
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+var Platform = {};
+
+/*
+ * Copyright 2012 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/*
+  This is a limited shim for ShadowDOM css styling.
+  https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles
+
+  The intention here is to support only the styling features which can be
+  relatively simply implemented. The goal is to allow users to avoid the
+  most obvious pitfalls and do so without compromising performance significantly.
+  For ShadowDOM styling that's not covered here, a set of best practices
+  can be provided that should allow users to accomplish more complex styling.
+
+  The following is a list of specific ShadowDOM styling features and a brief
+  discussion of the approach used to shim.
+
+  Shimmed features:
+
+  * @host: ShadowDOM allows styling of the shadowRoot's host element using the
+  @host rule. To shim this feature, the @host styles are reformatted and
+  prefixed with a given scope name and promoted to a document level stylesheet.
+  For example, given a scope name of .foo, a rule like this:
+
+    @host {
+      * {
+        background: red;
+      }
+    }
+
+  becomes:
+
+    .foo {
+      background: red;
+    }
+
+  * encapsultion: Styles defined within ShadowDOM, apply only to
+  dom inside the ShadowDOM. Polymer uses one of two techniques to imlement
+  this feature.
+
+  By default, rules are prefixed with the host element tag name
+  as a descendant selector. This ensures styling does not leak out of the 'top'
+  of the element's ShadowDOM. For example,
+
+  div {
+      font-weight: bold;
+    }
+
+  becomes:
+
+  x-foo div {
+      font-weight: bold;
+    }
+
+  becomes:
+
+
+  Alternatively, if Platform.ShadowCSS.strictStyling is set to true then
+  selectors are scoped by adding an attribute selector suffix to each
+  simple selector that contains the host element tag name. Each element
+  in the element's ShadowDOM template is also given the scope attribute.
+  Thus, these rules match only elements that have the scope attribute.
+  For example, given a scope name of x-foo, a rule like this:
+
+    div {
+      font-weight: bold;
+    }
+
+  becomes:
+
+    div[x-foo] {
+      font-weight: bold;
+    }
+
+  Note that elements that are dynamically added to a scope must have the scope
+  selector added to them manually.
+
+  * ::pseudo: These rules are converted to rules that take advantage of the
+  pseudo attribute. For example, a shadowRoot like this inside an x-foo
+
+    <div pseudo="x-special">Special</div>
+
+  with a rule like this:
+
+    x-foo::x-special { ... }
+
+  becomes:
+
+    x-foo [pseudo=x-special] { ... }
+
+  Unaddressed ShadowDOM styling features:
+
+  * upper/lower bound encapsulation: Styles which are defined outside a
+  shadowRoot should not cross the ShadowDOM boundary and should not apply
+  inside a shadowRoot.
+
+  This styling behavior is not emulated. Some possible ways to do this that
+  were rejected due to complexity and/or performance concerns include: (1) reset
+  every possible property for every possible selector for a given scope name;
+  (2) re-implement css in javascript.
+
+  As an alternative, users should make sure to use selectors
+  specific to the scope in which they are working.
+
+  * ::distributed: This behavior is not emulated. It's often not necessary
+  to style the contents of a specific insertion point and instead, descendants
+  of the host element can be styled selectively. Users can also create an
+  extra node around an insertion point and style that node's contents
+  via descendent selectors. For example, with a shadowRoot like this:
+
+    <style>
+      content::-webkit-distributed(div) {
+        background: red;
+      }
+    </style>
+    <content></content>
+
+  could become:
+
+    <style>
+      / *@polyfill .content-container div * /
+      content::-webkit-distributed(div) {
+        background: red;
+      }
+    </style>
+    <div class="content-container">
+      <content></content>
+    </div>
+
+  Note the use of @polyfill in the comment above a ShadowDOM specific style
+  declaration. This is a directive to the styling shim to use the selector
+  in comments in lieu of the next selector when running under polyfill.
+*/
+(function(scope) {
+
+var ShadowCSS = {
+  strictStyling: false,
+  registry: {},
+  // Shim styles for a given root associated with a name and extendsName
+  // 1. cache root styles by name
+  // 2. optionally tag root nodes with scope name
+  // 3. shim polyfill directives /* @polyfill */
+  // 4. shim @host and scoping
+  shimStyling: function(root, name, extendsName) {
+    if (root) {
+      // use caching to make working with styles nodes easier and to facilitate
+      // lookup of extendee
+      var def = this.registerDefinition(root, name, extendsName);
+      // find styles and apply shimming...
+      if (this.strictStyling) {
+        this.applyScopeToContent(root, name);
+      }
+      this.shimPolyfillDirectives(def.rootStyles, name);
+      this.applyShimming(def.scopeStyles, name);
+    }
+  },
+  // Shim styles to be placed inside a shadowRoot.
+  // 1. shim polyfill directives /* @polyfill */
+  // 2. shim @host and scoping
+  shimShadowDOMStyling: function(styles, name) {
+    this.shimPolyfillDirectives(styles, name);
+    this.applyShimming(styles, name);
+  },
+  registerDefinition: function(root, name, extendsName) {
+    var def = this.registry[name] = {
+      root: root,
+      name: name,
+      extendsName: extendsName
+    }
+    var styles = root.querySelectorAll('style');
+    styles = styles ? Array.prototype.slice.call(styles, 0) : [];
+    def.rootStyles = styles;
+    def.scopeStyles = def.rootStyles;
+    var extendee = this.registry[def.extendsName];
+    if (extendee) {
+      def.scopeStyles = def.scopeStyles.concat(extendee.scopeStyles);
+    }
+    return def;
+  },
+  applyScopeToContent: function(root, name) {
+    if (root) {
+      // add the name attribute to each node in root.
+      Array.prototype.forEach.call(root.querySelectorAll('*'),
+          function(node) {
+            node.setAttribute(name, '');
+          });
+      // and template contents too
+      Array.prototype.forEach.call(root.querySelectorAll('template'),
+          function(template) {
+            this.applyScopeToContent(template.content, name);
+          },
+          this);
+    }
+  },
+  /*
+   * Process styles to convert native ShadowDOM rules that will trip
+   * up the css parser; we rely on decorating the stylesheet with comments.
+   *
+   * For example, we convert this rule:
+   *
+   * (comment start) @polyfill @host g-menu-item (comment end)
+   * shadow::-webkit-distributed(g-menu-item) {
+   *
+   * to this:
+   *
+   * scopeName g-menu-item {
+   *
+  **/
+  shimPolyfillDirectives: function(styles, name) {
+    if (styles) {
+      Array.prototype.forEach.call(styles, function(s) {
+        s.textContent = this.convertPolyfillDirectives(s.textContent, name);
+      }, this);
+    }
+  },
+  convertPolyfillDirectives: function(cssText, name) {
+    var r = '', l = 0, matches, selector;
+    while (matches = cssPolyfillCommentRe.exec(cssText)) {
+      r += cssText.substring(l, matches.index);
+      // remove end comment delimiter (*/)
+      selector = matches[1].slice(0, -2).replace(hostRe, name);
+      r += this.scopeSelector(selector, name) + '{';
+      l = cssPolyfillCommentRe.lastIndex;
+    }
+    r += cssText.substring(l, cssText.length);
+    return r;
+  },
+  // apply @host and scope shimming
+  applyShimming: function(styles, name) {
+    var cssText = this.shimAtHost(styles, name);
+    cssText += this.shimScoping(styles, name);
+    addCssToDocument(cssText);
+  },
+  // form: @host { .foo { declarations } }
+  // becomes: scopeName.foo { declarations }
+  shimAtHost: function(styles, name) {
+    if (styles) {
+      return this.convertAtHostStyles(styles, name);
+    }
+  },
+  convertAtHostStyles: function(styles, name) {
+    var cssText = stylesToCssText(styles);
+    var r = '', l=0, matches;
+    while (matches = hostRuleRe.exec(cssText)) {
+      r += cssText.substring(l, matches.index);
+      r += this.scopeHostCss(matches[1], name);
+      l = hostRuleRe.lastIndex;
+    }
+    r += cssText.substring(l, cssText.length);
+    var re = new RegExp('^' + name + selectorReSuffix, 'm');
+    var cssText = rulesToCss(this.findAtHostRules(cssToRules(r),
+      re));
+    return cssText;
+  },
+  scopeHostCss: function(cssText, name) {
+    var r = '', matches;
+    while (matches = selectorRe.exec(cssText)) {
+      r += this.scopeHostSelector(matches[1], name) +' ' + matches[2] + '\n\t';
+    }
+    return r;
+  },
+  // supports scopig by name and  [is=name] syntax
+  scopeHostSelector: function(selector, name) {
+    var r = [], parts = selector.split(','), is = '[is=' + name + ']';
+    parts.forEach(function(p) {
+      p = p.trim();
+      // selector: *|:scope -> name
+      if (p.match(hostElementRe)) {
+        p = p.replace(hostElementRe, name + '$1$3, ' + is + '$1$3');
+      // selector: .foo -> name.foo, [bar] -> name[bar]
+      } else if (p.match(hostFixableRe)) {
+        p = name + p + ', ' + is + p;
+      }
+      r.push(p);
+    }, this);
+    return r.join(', ');
+  },
+  // consider styles that do not include component name in the selector to be
+  // unscoped and in need of promotion;
+  // for convenience, also consider keyframe rules this way.
+  findAtHostRules: function(cssRules, matcher) {
+    return Array.prototype.filter.call(cssRules,
+      this.isHostRule.bind(this, matcher));
+  },
+  isHostRule: function(matcher, cssRule) {
+    return (cssRule.selectorText && cssRule.selectorText.match(matcher)) ||
+      (cssRule.cssRules && this.findAtHostRules(cssRule.cssRules, matcher).length) ||
+      (cssRule.type == CSSRule.WEBKIT_KEYFRAMES_RULE);
+  },
+  /* Ensure styles are scoped. Pseudo-scoping takes a rule like:
+   *
+   *  .foo {... }
+   *
+   *  and converts this to
+   *
+   *  scopeName .foo { ... }
+  */
+  shimScoping: function(styles, name) {
+    if (styles) {
+      return this.convertScopedStyles(styles, name);
+    }
+  },
+  convertScopedStyles: function(styles, name) {
+    Array.prototype.forEach.call(styles, function(s) {
+      if (s.parentNode) {
+        s.parentNode.removeChild(s);
+      }
+    });
+    var cssText = stylesToCssText(styles).replace(hostRuleRe, '');
+    cssText = this.convertPseudos(cssText);
+    var rules = cssToRules(cssText);
+    cssText = this.scopeRules(rules, name);
+    return cssText;
+  },
+  convertPseudos: function(cssText) {
+    return cssText.replace(cssPseudoRe, ' [pseudo=$1]');
+  },
+  // change a selector like 'div' to 'name div'
+  scopeRules: function(cssRules, name) {
+    var cssText = '';
+    Array.prototype.forEach.call(cssRules, function(rule) {
+      if (rule.selectorText && (rule.style && rule.style.cssText)) {
+        cssText += this.scopeSelector(rule.selectorText, name,
+          this.strictStyling) + ' {\n\t';
+        cssText += this.propertiesFromRule(rule) + '\n}\n\n';
+      } else if (rule.media) {
+        cssText += '@media ' + rule.media.mediaText + ' {\n';
+        cssText += this.scopeRules(rule.cssRules, name);
+        cssText += '\n}\n\n';
+      } else if (rule.cssText) {
+        cssText += rule.cssText + '\n\n';
+      }
+    }, this);
+    return cssText;
+  },
+  scopeSelector: function(selector, name, strict) {
+    var r = [], parts = selector.split(',');
+    parts.forEach(function(p) {
+      p = p.trim();
+      if (this.selectorNeedsScoping(p, name)) {
+        p = strict ? this.applyStrictSelectorScope(p, name) :
+          this.applySimpleSelectorScope(p, name);
+      }
+      r.push(p);
+    }, this);
+    return r.join(', ');
+  },
+  selectorNeedsScoping: function(selector, name) {
+    var matchScope = '(' + name + '|\\[is=' + name + '\\])';
+    var re = new RegExp('^' + matchScope + selectorReSuffix, 'm');
+    return !selector.match(re);
+  },
+  // scope via name and [is=name]
+  applySimpleSelectorScope: function(selector, name) {
+    return name + ' ' + selector + ', ' + '[is=' + name + '] ' + selector;
+  },
+  // return a selector with [name] suffix on each simple selector
+  // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name]
+  applyStrictSelectorScope: function(selector, name) {
+    var splits = [' ', '>', '+', '~'],
+      scoped = selector,
+      attrName = '[' + name + ']';
+    splits.forEach(function(sep) {
+      var parts = scoped.split(sep);
+      scoped = parts.map(function(p) {
+        var t = p.trim();
+        if (t && (splits.indexOf(t) < 0) && (t.indexOf(attrName) < 0)) {
+          p = t.replace(/([^:]*)(:*)(.*)/, '$1' + attrName + '$2$3')
+        }
+        return p;
+      }).join(sep);
+    });
+    return scoped;
+  },
+  propertiesFromRule: function(rule) {
+    var properties = rule.style.cssText;
+    // TODO(sorvell): Chrome cssom incorrectly removes quotes from the content
+    // property. (https://code.google.com/p/chromium/issues/detail?id=247231)
+    if (rule.style.content && !rule.style.content.match(/['"]+/)) {
+      properties = 'content: \'' + rule.style.content + '\';\n' +
+        rule.style.cssText.replace(/content:[^;]*;/g, '');
+    }
+    return properties;
+  }
+};
+
+var hostRuleRe = /@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,
+    selectorRe = /([^{]*)({[\s\S]*?})/gim,
+    hostElementRe = /(.*)((?:\*)|(?:\:scope))(.*)/,
+    hostFixableRe = /^[.\[:]/,
+    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
+    cssPolyfillCommentRe = /\/\*\s*@polyfill ([^*]*\*+([^/*][^*]*\*+)*\/)([^{]*?){/gim,
+    cssPseudoRe = /::(x-[^\s{,(]*)/gim,
+    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$',
+    hostRe = /@host/gim;
+
+function stylesToCssText(styles, preserveComments) {
+  var cssText = '';
+  Array.prototype.forEach.call(styles, function(s) {
+    cssText += s.textContent + '\n\n';
+  });
+  // strip comments for easier processing
+  if (!preserveComments) {
+    cssText = cssText.replace(cssCommentRe, '');
+  }
+  return cssText;
+}
+
+function cssToRules(cssText) {
+  var style = document.createElement('style');
+  style.textContent = cssText;
+  document.head.appendChild(style);
+  var rules = style.sheet.cssRules;
+  style.parentNode.removeChild(style);
+  return rules;
+}
+
+function rulesToCss(cssRules) {
+  for (var i=0, css=[]; i < cssRules.length; i++) {
+    css.push(cssRules[i].cssText);
+  }
+  return css.join('\n\n');
+}
+
+function addCssToDocument(cssText) {
+  if (cssText) {
+    getSheet().appendChild(document.createTextNode(cssText));
+  }
+}
+
+var sheet;
+function getSheet() {
+  if (!sheet) {
+    sheet = document.createElement("style");
+    sheet.setAttribute('ShadowCSSShim', '');
+  }
+  return sheet;
+}
+
+// add polyfill stylesheet to document
+if (window.ShadowDOMPolyfill) {
+  addCssToDocument('style { display: none !important; }\n');
+  var head = document.querySelector('head');
+  head.insertBefore(getSheet(), head.childNodes[0]);
+}
+
+// exports
+scope.ShadowCSS = ShadowCSS;
+
+})(window.Platform);
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+(function(scope) {
+  // TODO(terry): Remove shimShadowDOMStyling2 until wrap/unwrap from a
+  //              dart:html Element to a JS DOM node is available.
+  /**
+   * Given the content of a STYLE tag and the name of a component shim the CSS
+   * and return the new scoped CSS to replace the STYLE's content.  The content
+   * is replaced in Dart's implementation of PolymerElement.
+   */
+  function shimShadowDOMStyling2(styleContent, name) {
+    if (window.ShadowDOMPolyfill) {
+      var content = this.convertPolyfillDirectives(styleContent, name);
+
+      // applyShimming calls shimAtHost and shipScoping
+      // shimAtHost code:
+      var r = '', l=0, matches;
+      while (matches = hostRuleRe.exec(content)) {
+        r += content.substring(l, matches.index);
+        r += this.scopeHostCss(matches[1], name);
+        l = hostRuleRe.lastIndex;
+      }
+      r += content.substring(l, content.length);
+      var re = new RegExp('^' + name + selectorReSuffix, 'm');
+      var atHostCssText = rulesToCss(this.findAtHostRules(cssToRules(r), re));
+
+      // shimScoping code:
+      // strip comments for easier processing
+      content = content.replace(cssCommentRe, '');
+
+      content = this.convertPseudos(content);
+      var rules = cssToRules(content);
+      var cssText = this.scopeRules(rules, name);
+
+      return atHostCssText + cssText;
+    }
+  }
+
+  // Minimal copied code from ShadowCSS, that is not exposed in
+  // PlatForm.ShadowCSS (local code).
+  var hostRuleRe = /@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,
+    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
+    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$';
+
+  function cssToRules(cssText) {
+    var style = document.createElement('style');
+    style.textContent = cssText;
+    document.head.appendChild(style);
+    var rules = style.sheet.cssRules;
+    style.parentNode.removeChild(style);
+    return rules;
+  }
+
+  function rulesToCss(cssRules) {
+    for (var i=0, css=[]; i < cssRules.length; i++) {
+      css.push(cssRules[i].cssText);
+    }
+    return css.join('\n\n');
+  }
+
+  // exports
+  scope.ShadowCSS.shimShadowDOMStyling2 = shimShadowDOMStyling2;
+})(window.Platform);
+
 }
\ No newline at end of file
diff --git a/pkg/shadow_dom/lib/shadow_dom.min.js b/pkg/shadow_dom/lib/shadow_dom.min.js
index e9d570e0010..888ec35c3d3 100644
--- a/pkg/shadow_dom/lib/shadow_dom.min.js
+++ b/pkg/shadow_dom/lib/shadow_dom.min.js
@@ -1,2 +1,2 @@
-if(!HTMLElement.prototype.createShadowRoot&&!HTMLElement.prototype.webkitCreateShadowRoot||window.__forceShadowDomPolyfill){(function(){Element.prototype.webkitCreateShadowRoot&&(Element.prototype.webkitCreateShadowRoot=function(){return window.ShadowDOMPolyfill.wrapIfNeeded(this).createShadowRoot()})})();var SideTable;"undefined"!=typeof WeakMap&&0>navigator.userAgent.indexOf("Firefox/")?SideTable=WeakMap:function(){var e=Object.defineProperty,t=Object.hasOwnProperty,n=(new Date).getTime()%1e9;SideTable=function(){this.name="__st"+(1e9*Math.random()>>>0)+(n++ +"__")},SideTable.prototype={set:function(t,n){e(t,this.name,{value:n,writable:!0})},get:function(e){return t.call(e,this.name)?e[this.name]:void 0},"delete":function(e){this.set(e,void 0)}}}();var ShadowDOMPolyfill={};(function(e){"use strict";function t(e){if(!e)throw new Error("Assertion failed")}function n(e,t){return Object.getOwnPropertyNames(t).forEach(function(n){Object.defineProperty(e,n,Object.getOwnPropertyDescriptor(t,n))}),e}function r(e,t){return Object.getOwnPropertyNames(t).forEach(function(n){switch(n){case"arguments":case"caller":case"length":case"name":case"prototype":case"toString":return}Object.defineProperty(e,n,Object.getOwnPropertyDescriptor(t,n))}),e}function i(e){var t=e.__proto__||Object.getPrototypeOf(e),n=M.get(t);if(n)return n;var r=i(t),o=p(r);return u(t,o,e),o}function o(e,t){l(e,t,!0)}function a(e,t){l(t,e,!1)}function l(e,t,n){Object.getOwnPropertyNames(e).forEach(function(r){if(!(r in t)){L&&e.__lookupGetter__(r);var i;try{i=Object.getOwnPropertyDescriptor(e,r)}catch(o){i=C}var a,l;if(n&&"function"==typeof i.value)return t[r]=function(){return this.impl[r].apply(this.impl,arguments)},void 0;a=function(){return this.impl[r]},(i.writable||i.set)&&(l=function(e){this.impl[r]=e}),Object.defineProperty(t,r,{get:a,set:l,configurable:i.configurable,enumerable:i.enumerable})}})}function s(e,t,n){var i=e.prototype;u(i,t,n),r(t,e)}function u(e,n,r){var i=n.prototype;t(void 0===M.get(e)),M.set(e,n),o(e,i),r&&a(i,r)}function c(e,t){return M.get(t.prototype)===e}function d(e){var t=Object.getPrototypeOf(e),n=i(t),r=p(n);return u(t,r,e),r}function p(e){function t(t){e.call(this,t)}return t.prototype=Object.create(e.prototype),t.prototype.constructor=t,t._ShadowDOMPolyfill$isGeneratedWrapper=!0,t}function h(e){return e instanceof N.EventTarget||e instanceof N.Event||e instanceof N.DOMImplementation}function f(e){return e instanceof D||e instanceof O||e instanceof _||e instanceof H}function m(e){if(null===e)return null;t(f(e));var n=S.get(e);if(!n){var r=i(e);n=new r(e),S.set(e,n)}return n}function g(e){return null===e?null:(t(h(e)),e.impl)}function w(e){return e&&h(e)?g(e):e}function v(e){return 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[pseudo=$1]")},scopeRules:function(a,b){var c="";return Array.prototype.forEach.call(a,function(a){a.selectorText&&a.style&&a.style.cssText?(c+=this.scopeSelector(a.selectorText,b,this.strictStyling)+" {\n	",c+=this.propertiesFromRule(a)+"\n}\n\n"):a.media?(c+="@media "+a.media.mediaText+" {\n",c+=this.scopeRules(a.cssRules,b),c+="\n}\n\n"):a.cssText&&(c+=a.cssText+"\n\n")},this),c},scopeSelector:function(a,b,c){var d=[],e=a.split(",");return e.forEach(function(a){a=a.trim(),this.selectorNeedsScoping(a,b)&&(a=c?this.applyStrictSelectorScope(a,b):this.applySimpleSelectorScope(a,b)),d.push(a)},this),d.join(", ")},selectorNeedsScoping:function(a,b){var c="("+b+"|\\[is="+b+"\\])",d=new RegExp("^"+c+p,"m");return!a.match(d)},applySimpleSelectorScope:function(a,b){return b+" "+a+", "+"[is="+b+"] "+a},applyStrictSelectorScope:function(a,b){var c=[" ",">","+","~"],d=a,e="["+b+"]";return c.forEach(function(a){var b=d.split(a);d=b.map(function(a){var b=a.trim();return b&&c.indexOf(b)<0&&b.indexOf(e)<0&&(a=b.replace(/([^:]*)(:*)(.*)/,"$1"+e+"$2$3")),a}).join(a)}),d},propertiesFromRule:function(a){var b=a.style.cssText;return a.style.content&&!a.style.content.match(/['"]+/)&&(b="content: '"+a.style.content+"';\n"+a.style.cssText.replace(/content:[^;]*;/g,"")),b}},i=/@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,j=/([^{]*)({[\s\S]*?})/gim,k=/(.*)((?:\*)|(?:\:scope))(.*)/,l=/^[.\[:]/,m=/\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,n=/\/\*\s*@polyfill ([^*]*\*+([^/*][^*]*\*+)*\/)([^{]*?){/gim,o=/::(x-[^\s{,(]*)/gim,p="([>\\s~+[.,{:][\\s\\S]*)?$",q=/@host/gim;if(window.ShadowDOMPolyfill){e("style { display: none !important; }\n");var r=document.querySelector("head");r.insertBefore(f(),r.childNodes[0])}a.ShadowCSS=h}(window.Platform),function(a){function b(a,b){if(window.ShadowDOMPolyfill){for(var h,i=this.convertPolyfillDirectives(a,b),j="",k=0;h=e.exec(i);)j+=i.substring(k,h.index),j+=this.scopeHostCss(h[1],b),k=e.lastIndex;j+=i.substring(k,i.length);var l=new RegExp("^"+b+g,"m"),m=d(this.findAtHostRules(c(j),l));i=i.replace(f,""),i=this.convertPseudos(i);var n=c(i),o=this.scopeRules(n,b);return m+o}}function c(a){var b=document.createElement("style");b.textContent=a,document.head.appendChild(b);var c=b.sheet.cssRules;return b.parentNode.removeChild(b),c}function d(a){for(var b=0,c=[];b<a.length;b++)c.push(a[b].cssText);return c.join("\n\n")}var e=/@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,f=/\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,g="([>\\s~+[.,{:][\\s\\S]*)?$";a.ShadowCSS.shimShadowDOMStyling2=b}(window.Platform)}
\ No newline at end of file
diff --git a/pkg/shadow_dom/lib/src/platform/ShadowCSS.js b/pkg/shadow_dom/lib/src/platform/ShadowCSS.js
new file mode 100644
index 00000000000..96861a13640
--- /dev/null
+++ b/pkg/shadow_dom/lib/src/platform/ShadowCSS.js
@@ -0,0 +1,452 @@
+/*
+ * Copyright 2012 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/*
+  This is a limited shim for ShadowDOM css styling.
+  https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles
+
+  The intention here is to support only the styling features which can be
+  relatively simply implemented. The goal is to allow users to avoid the
+  most obvious pitfalls and do so without compromising performance significantly.
+  For ShadowDOM styling that's not covered here, a set of best practices
+  can be provided that should allow users to accomplish more complex styling.
+
+  The following is a list of specific ShadowDOM styling features and a brief
+  discussion of the approach used to shim.
+
+  Shimmed features:
+
+  * @host: ShadowDOM allows styling of the shadowRoot's host element using the
+  @host rule. To shim this feature, the @host styles are reformatted and
+  prefixed with a given scope name and promoted to a document level stylesheet.
+  For example, given a scope name of .foo, a rule like this:
+
+    @host {
+      * {
+        background: red;
+      }
+    }
+
+  becomes:
+
+    .foo {
+      background: red;
+    }
+
+  * encapsultion: Styles defined within ShadowDOM, apply only to
+  dom inside the ShadowDOM. Polymer uses one of two techniques to imlement
+  this feature.
+
+  By default, rules are prefixed with the host element tag name
+  as a descendant selector. This ensures styling does not leak out of the 'top'
+  of the element's ShadowDOM. For example,
+
+  div {
+      font-weight: bold;
+    }
+
+  becomes:
+
+  x-foo div {
+      font-weight: bold;
+    }
+
+  becomes:
+
+
+  Alternatively, if Platform.ShadowCSS.strictStyling is set to true then
+  selectors are scoped by adding an attribute selector suffix to each
+  simple selector that contains the host element tag name. Each element
+  in the element's ShadowDOM template is also given the scope attribute.
+  Thus, these rules match only elements that have the scope attribute.
+  For example, given a scope name of x-foo, a rule like this:
+
+    div {
+      font-weight: bold;
+    }
+
+  becomes:
+
+    div[x-foo] {
+      font-weight: bold;
+    }
+
+  Note that elements that are dynamically added to a scope must have the scope
+  selector added to them manually.
+
+  * ::pseudo: These rules are converted to rules that take advantage of the
+  pseudo attribute. For example, a shadowRoot like this inside an x-foo
+
+    <div pseudo="x-special">Special</div>
+
+  with a rule like this:
+
+    x-foo::x-special { ... }
+
+  becomes:
+
+    x-foo [pseudo=x-special] { ... }
+
+  Unaddressed ShadowDOM styling features:
+
+  * upper/lower bound encapsulation: Styles which are defined outside a
+  shadowRoot should not cross the ShadowDOM boundary and should not apply
+  inside a shadowRoot.
+
+  This styling behavior is not emulated. Some possible ways to do this that
+  were rejected due to complexity and/or performance concerns include: (1) reset
+  every possible property for every possible selector for a given scope name;
+  (2) re-implement css in javascript.
+
+  As an alternative, users should make sure to use selectors
+  specific to the scope in which they are working.
+
+  * ::distributed: This behavior is not emulated. It's often not necessary
+  to style the contents of a specific insertion point and instead, descendants
+  of the host element can be styled selectively. Users can also create an
+  extra node around an insertion point and style that node's contents
+  via descendent selectors. For example, with a shadowRoot like this:
+
+    <style>
+      content::-webkit-distributed(div) {
+        background: red;
+      }
+    </style>
+    <content></content>
+
+  could become:
+
+    <style>
+      / *@polyfill .content-container div * /
+      content::-webkit-distributed(div) {
+        background: red;
+      }
+    </style>
+    <div class="content-container">
+      <content></content>
+    </div>
+
+  Note the use of @polyfill in the comment above a ShadowDOM specific style
+  declaration. This is a directive to the styling shim to use the selector
+  in comments in lieu of the next selector when running under polyfill.
+*/
+(function(scope) {
+
+var ShadowCSS = {
+  strictStyling: false,
+  registry: {},
+  // Shim styles for a given root associated with a name and extendsName
+  // 1. cache root styles by name
+  // 2. optionally tag root nodes with scope name
+  // 3. shim polyfill directives /* @polyfill */
+  // 4. shim @host and scoping
+  shimStyling: function(root, name, extendsName) {
+    if (root) {
+      // use caching to make working with styles nodes easier and to facilitate
+      // lookup of extendee
+      var def = this.registerDefinition(root, name, extendsName);
+      // find styles and apply shimming...
+      if (this.strictStyling) {
+        this.applyScopeToContent(root, name);
+      }
+      this.shimPolyfillDirectives(def.rootStyles, name);
+      this.applyShimming(def.scopeStyles, name);
+    }
+  },
+  // Shim styles to be placed inside a shadowRoot.
+  // 1. shim polyfill directives /* @polyfill */
+  // 2. shim @host and scoping
+  shimShadowDOMStyling: function(styles, name) {
+    this.shimPolyfillDirectives(styles, name);
+    this.applyShimming(styles, name);
+  },
+  registerDefinition: function(root, name, extendsName) {
+    var def = this.registry[name] = {
+      root: root,
+      name: name,
+      extendsName: extendsName
+    }
+    var styles = root.querySelectorAll('style');
+    styles = styles ? Array.prototype.slice.call(styles, 0) : [];
+    def.rootStyles = styles;
+    def.scopeStyles = def.rootStyles;
+    var extendee = this.registry[def.extendsName];
+    if (extendee) {
+      def.scopeStyles = def.scopeStyles.concat(extendee.scopeStyles);
+    }
+    return def;
+  },
+  applyScopeToContent: function(root, name) {
+    if (root) {
+      // add the name attribute to each node in root.
+      Array.prototype.forEach.call(root.querySelectorAll('*'),
+          function(node) {
+            node.setAttribute(name, '');
+          });
+      // and template contents too
+      Array.prototype.forEach.call(root.querySelectorAll('template'),
+          function(template) {
+            this.applyScopeToContent(template.content, name);
+          },
+          this);
+    }
+  },
+  /*
+   * Process styles to convert native ShadowDOM rules that will trip
+   * up the css parser; we rely on decorating the stylesheet with comments.
+   *
+   * For example, we convert this rule:
+   *
+   * (comment start) @polyfill @host g-menu-item (comment end)
+   * shadow::-webkit-distributed(g-menu-item) {
+   *
+   * to this:
+   *
+   * scopeName g-menu-item {
+   *
+  **/
+  shimPolyfillDirectives: function(styles, name) {
+    if (styles) {
+      Array.prototype.forEach.call(styles, function(s) {
+        s.textContent = this.convertPolyfillDirectives(s.textContent, name);
+      }, this);
+    }
+  },
+  convertPolyfillDirectives: function(cssText, name) {
+    var r = '', l = 0, matches, selector;
+    while (matches = cssPolyfillCommentRe.exec(cssText)) {
+      r += cssText.substring(l, matches.index);
+      // remove end comment delimiter (*/)
+      selector = matches[1].slice(0, -2).replace(hostRe, name);
+      r += this.scopeSelector(selector, name) + '{';
+      l = cssPolyfillCommentRe.lastIndex;
+    }
+    r += cssText.substring(l, cssText.length);
+    return r;
+  },
+  // apply @host and scope shimming
+  applyShimming: function(styles, name) {
+    var cssText = this.shimAtHost(styles, name);
+    cssText += this.shimScoping(styles, name);
+    addCssToDocument(cssText);
+  },
+  // form: @host { .foo { declarations } }
+  // becomes: scopeName.foo { declarations }
+  shimAtHost: function(styles, name) {
+    if (styles) {
+      return this.convertAtHostStyles(styles, name);
+    }
+  },
+  convertAtHostStyles: function(styles, name) {
+    var cssText = stylesToCssText(styles);
+    var r = '', l=0, matches;
+    while (matches = hostRuleRe.exec(cssText)) {
+      r += cssText.substring(l, matches.index);
+      r += this.scopeHostCss(matches[1], name);
+      l = hostRuleRe.lastIndex;
+    }
+    r += cssText.substring(l, cssText.length);
+    var re = new RegExp('^' + name + selectorReSuffix, 'm');
+    var cssText = rulesToCss(this.findAtHostRules(cssToRules(r),
+      re));
+    return cssText;
+  },
+  scopeHostCss: function(cssText, name) {
+    var r = '', matches;
+    while (matches = selectorRe.exec(cssText)) {
+      r += this.scopeHostSelector(matches[1], name) +' ' + matches[2] + '\n\t';
+    }
+    return r;
+  },
+  // supports scopig by name and  [is=name] syntax
+  scopeHostSelector: function(selector, name) {
+    var r = [], parts = selector.split(','), is = '[is=' + name + ']';
+    parts.forEach(function(p) {
+      p = p.trim();
+      // selector: *|:scope -> name
+      if (p.match(hostElementRe)) {
+        p = p.replace(hostElementRe, name + '$1$3, ' + is + '$1$3');
+      // selector: .foo -> name.foo, [bar] -> name[bar]
+      } else if (p.match(hostFixableRe)) {
+        p = name + p + ', ' + is + p;
+      }
+      r.push(p);
+    }, this);
+    return r.join(', ');
+  },
+  // consider styles that do not include component name in the selector to be
+  // unscoped and in need of promotion;
+  // for convenience, also consider keyframe rules this way.
+  findAtHostRules: function(cssRules, matcher) {
+    return Array.prototype.filter.call(cssRules,
+      this.isHostRule.bind(this, matcher));
+  },
+  isHostRule: function(matcher, cssRule) {
+    return (cssRule.selectorText && cssRule.selectorText.match(matcher)) ||
+      (cssRule.cssRules && this.findAtHostRules(cssRule.cssRules, matcher).length) ||
+      (cssRule.type == CSSRule.WEBKIT_KEYFRAMES_RULE);
+  },
+  /* Ensure styles are scoped. Pseudo-scoping takes a rule like:
+   *
+   *  .foo {... }
+   *
+   *  and converts this to
+   *
+   *  scopeName .foo { ... }
+  */
+  shimScoping: function(styles, name) {
+    if (styles) {
+      return this.convertScopedStyles(styles, name);
+    }
+  },
+  convertScopedStyles: function(styles, name) {
+    Array.prototype.forEach.call(styles, function(s) {
+      if (s.parentNode) {
+        s.parentNode.removeChild(s);
+      }
+    });
+    var cssText = stylesToCssText(styles).replace(hostRuleRe, '');
+    cssText = this.convertPseudos(cssText);
+    var rules = cssToRules(cssText);
+    cssText = this.scopeRules(rules, name);
+    return cssText;
+  },
+  convertPseudos: function(cssText) {
+    return cssText.replace(cssPseudoRe, ' [pseudo=$1]');
+  },
+  // change a selector like 'div' to 'name div'
+  scopeRules: function(cssRules, name) {
+    var cssText = '';
+    Array.prototype.forEach.call(cssRules, function(rule) {
+      if (rule.selectorText && (rule.style && rule.style.cssText)) {
+        cssText += this.scopeSelector(rule.selectorText, name,
+          this.strictStyling) + ' {\n\t';
+        cssText += this.propertiesFromRule(rule) + '\n}\n\n';
+      } else if (rule.media) {
+        cssText += '@media ' + rule.media.mediaText + ' {\n';
+        cssText += this.scopeRules(rule.cssRules, name);
+        cssText += '\n}\n\n';
+      } else if (rule.cssText) {
+        cssText += rule.cssText + '\n\n';
+      }
+    }, this);
+    return cssText;
+  },
+  scopeSelector: function(selector, name, strict) {
+    var r = [], parts = selector.split(',');
+    parts.forEach(function(p) {
+      p = p.trim();
+      if (this.selectorNeedsScoping(p, name)) {
+        p = strict ? this.applyStrictSelectorScope(p, name) :
+          this.applySimpleSelectorScope(p, name);
+      }
+      r.push(p);
+    }, this);
+    return r.join(', ');
+  },
+  selectorNeedsScoping: function(selector, name) {
+    var matchScope = '(' + name + '|\\[is=' + name + '\\])';
+    var re = new RegExp('^' + matchScope + selectorReSuffix, 'm');
+    return !selector.match(re);
+  },
+  // scope via name and [is=name]
+  applySimpleSelectorScope: function(selector, name) {
+    return name + ' ' + selector + ', ' + '[is=' + name + '] ' + selector;
+  },
+  // return a selector with [name] suffix on each simple selector
+  // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name]
+  applyStrictSelectorScope: function(selector, name) {
+    var splits = [' ', '>', '+', '~'],
+      scoped = selector,
+      attrName = '[' + name + ']';
+    splits.forEach(function(sep) {
+      var parts = scoped.split(sep);
+      scoped = parts.map(function(p) {
+        var t = p.trim();
+        if (t && (splits.indexOf(t) < 0) && (t.indexOf(attrName) < 0)) {
+          p = t.replace(/([^:]*)(:*)(.*)/, '$1' + attrName + '$2$3')
+        }
+        return p;
+      }).join(sep);
+    });
+    return scoped;
+  },
+  propertiesFromRule: function(rule) {
+    var properties = rule.style.cssText;
+    // TODO(sorvell): Chrome cssom incorrectly removes quotes from the content
+    // property. (https://code.google.com/p/chromium/issues/detail?id=247231)
+    if (rule.style.content && !rule.style.content.match(/['"]+/)) {
+      properties = 'content: \'' + rule.style.content + '\';\n' +
+        rule.style.cssText.replace(/content:[^;]*;/g, '');
+    }
+    return properties;
+  }
+};
+
+var hostRuleRe = /@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,
+    selectorRe = /([^{]*)({[\s\S]*?})/gim,
+    hostElementRe = /(.*)((?:\*)|(?:\:scope))(.*)/,
+    hostFixableRe = /^[.\[:]/,
+    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
+    cssPolyfillCommentRe = /\/\*\s*@polyfill ([^*]*\*+([^/*][^*]*\*+)*\/)([^{]*?){/gim,
+    cssPseudoRe = /::(x-[^\s{,(]*)/gim,
+    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$',
+    hostRe = /@host/gim;
+
+function stylesToCssText(styles, preserveComments) {
+  var cssText = '';
+  Array.prototype.forEach.call(styles, function(s) {
+    cssText += s.textContent + '\n\n';
+  });
+  // strip comments for easier processing
+  if (!preserveComments) {
+    cssText = cssText.replace(cssCommentRe, '');
+  }
+  return cssText;
+}
+
+function cssToRules(cssText) {
+  var style = document.createElement('style');
+  style.textContent = cssText;
+  document.head.appendChild(style);
+  var rules = style.sheet.cssRules;
+  style.parentNode.removeChild(style);
+  return rules;
+}
+
+function rulesToCss(cssRules) {
+  for (var i=0, css=[]; i < cssRules.length; i++) {
+    css.push(cssRules[i].cssText);
+  }
+  return css.join('\n\n');
+}
+
+function addCssToDocument(cssText) {
+  if (cssText) {
+    getSheet().appendChild(document.createTextNode(cssText));
+  }
+}
+
+var sheet;
+function getSheet() {
+  if (!sheet) {
+    sheet = document.createElement("style");
+    sheet.setAttribute('ShadowCSSShim', '');
+  }
+  return sheet;
+}
+
+// add polyfill stylesheet to document
+if (window.ShadowDOMPolyfill) {
+  addCssToDocument('style { display: none !important; }\n');
+  var head = document.querySelector('head');
+  head.insertBefore(getSheet(), head.childNodes[0]);
+}
+
+// exports
+scope.ShadowCSS = ShadowCSS;
+
+})(window.Platform);
\ No newline at end of file
diff --git a/pkg/shadow_dom/lib/src/platform/patches-shadow-css.js b/pkg/shadow_dom/lib/src/platform/patches-shadow-css.js
new file mode 100644
index 00000000000..952557070a4
--- /dev/null
+++ b/pkg/shadow_dom/lib/src/platform/patches-shadow-css.js
@@ -0,0 +1,65 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+(function(scope) {
+  // TODO(terry): Remove shimShadowDOMStyling2 until wrap/unwrap from a
+  //              dart:html Element to a JS DOM node is available.
+  /**
+   * Given the content of a STYLE tag and the name of a component shim the CSS
+   * and return the new scoped CSS to replace the STYLE's content.  The content
+   * is replaced in Dart's implementation of PolymerElement.
+   */
+  function shimShadowDOMStyling2(styleContent, name) {
+    if (window.ShadowDOMPolyfill) {
+      var content = this.convertPolyfillDirectives(styleContent, name);
+
+      // applyShimming calls shimAtHost and shipScoping
+      // shimAtHost code:
+      var r = '', l=0, matches;
+      while (matches = hostRuleRe.exec(content)) {
+        r += content.substring(l, matches.index);
+        r += this.scopeHostCss(matches[1], name);
+        l = hostRuleRe.lastIndex;
+      }
+      r += content.substring(l, content.length);
+      var re = new RegExp('^' + name + selectorReSuffix, 'm');
+      var atHostCssText = rulesToCss(this.findAtHostRules(cssToRules(r), re));
+
+      // shimScoping code:
+      // strip comments for easier processing
+      content = content.replace(cssCommentRe, '');
+
+      content = this.convertPseudos(content);
+      var rules = cssToRules(content);
+      var cssText = this.scopeRules(rules, name);
+
+      return atHostCssText + cssText;
+    }
+  }
+
+  // Minimal copied code from ShadowCSS, that is not exposed in
+  // PlatForm.ShadowCSS (local code).
+  var hostRuleRe = /@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,
+    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
+    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$';
+
+  function cssToRules(cssText) {
+    var style = document.createElement('style');
+    style.textContent = cssText;
+    document.head.appendChild(style);
+    var rules = style.sheet.cssRules;
+    style.parentNode.removeChild(style);
+    return rules;
+  }
+
+  function rulesToCss(cssRules) {
+    for (var i=0, css=[]; i < cssRules.length; i++) {
+      css.push(cssRules[i].cssText);
+    }
+    return css.join('\n\n');
+  }
+
+  // exports
+  scope.ShadowCSS.shimShadowDOMStyling2 = shimShadowDOMStyling2;
+})(window.Platform);
diff --git a/pkg/shadow_dom/lib/src/platform/patches-shadowdom-polyfill-before.js b/pkg/shadow_dom/lib/src/platform/patches-shadowdom-polyfill-before.js
new file mode 100644
index 00000000000..fe15015bdc9
--- /dev/null
+++ b/pkg/shadow_dom/lib/src/platform/patches-shadowdom-polyfill-before.js
@@ -0,0 +1,13 @@
+/*
+ * Copyright 2013 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+(function() {
+  // TODO(jmesserly): fix dart:html to use unprefixed name
+  if (Element.prototype.webkitCreateShadowRoot) {
+    Element.prototype.webkitCreateShadowRoot = function() {
+      return window.ShadowDOMPolyfill.wrapIfNeeded(this).createShadowRoot();
+    };
+  }
+})();
diff --git a/pkg/shadow_dom/lib/src/platform/patches-shadowdom-polyfill.js b/pkg/shadow_dom/lib/src/platform/patches-shadowdom-polyfill.js
new file mode 100644
index 00000000000..cafb59787c8
--- /dev/null
+++ b/pkg/shadow_dom/lib/src/platform/patches-shadowdom-polyfill.js
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2013 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+(function() {
+  var ShadowDOMPolyfill = window.ShadowDOMPolyfill;
+  var wrap = ShadowDOMPolyfill.wrap;
+
+  // patch in prefixed name
+  Object.defineProperties(HTMLElement.prototype, {
+    //TODO(sjmiles): review accessor alias with Arv
+    webkitShadowRoot: {
+      get: function() {
+        return this.shadowRoot;
+      }
+    }
+  });
+
+  //TODO(sjmiles): review method alias with Arv
+  HTMLElement.prototype.webkitCreateShadowRoot =
+      HTMLElement.prototype.createShadowRoot;
+
+  // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?)
+  window.dartExperimentalFixupGetTag = function(originalGetTag) {
+    var NodeList = ShadowDOMPolyfill.wrappers.NodeList;
+    var ShadowRoot = ShadowDOMPolyfill.wrappers.ShadowRoot;
+    var isWrapper = ShadowDOMPolyfill.isWrapper;
+    var unwrap = ShadowDOMPolyfill.unwrap;
+    function getTag(obj) {
+      if (obj instanceof NodeList) return 'NodeList';
+      if (obj instanceof ShadowRoot) return 'ShadowRoot';
+      if (obj instanceof MutationRecord) return 'MutationRecord';
+      if (obj instanceof MutationObserver) return 'MutationObserver';
+
+      if (isWrapper(obj)) {
+        obj = unwrap(obj);
+
+        // Fix up class names for Firefox. For some of them like
+        // HTMLFormElement and HTMLInputElement, the "constructor" property of
+        // the unwrapped nodes points at the wrapper for some reason.
+        // TODO(jmesserly): figure out why this is happening.
+        var ctor = obj.constructor;
+        if (ctor && ctor._ShadowDOMPolyfill$isGeneratedWrapper) {
+          var name = ctor._ShadowDOMPolyfill$cacheTag_;
+          if (!name) {
+            name = Object.prototype.toString.call(obj);
+            name = name.substring(8, name.length - 1);
+            ctor._ShadowDOMPolyfill$cacheTag_ = name;
+          }
+          return name;
+        }
+      }
+      return originalGetTag(obj);
+    }
+
+    return getTag;
+  };
+})();
diff --git a/pkg/shadow_dom/lib/src/platform/platform-init.js b/pkg/shadow_dom/lib/src/platform/platform-init.js
new file mode 100644
index 00000000000..4e83afc8c5f
--- /dev/null
+++ b/pkg/shadow_dom/lib/src/platform/platform-init.js
@@ -0,0 +1,5 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+var Platform = {};
diff --git a/pkg/shadow_dom/test/runner.html b/pkg/shadow_dom/test/runner.html
new file mode 100644
index 00000000000..83dd0eeaced
--- /dev/null
+++ b/pkg/shadow_dom/test/runner.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<!--
+Copyright 2012 The Polymer Authors. All rights reserved.
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file.
+-->
+<meta charset="utf-8">
+<link rel="stylesheet" href="../tool/node_modules/mocha/mocha.css">
+<script src="../tool/node_modules/chai/chai.js"></script>
+<script src="../tool/node_modules/mocha/mocha.js"></script>
+<script src="../tools/test/mocha-htmltest.js"></script>
+<script src="../tool/shadowdom.js"></script>
+<script src="../../../third_party/polymer/ShadowDOM/test/test.main.js"></script>
+<div id="mocha"></div>
+<script>
+mocha.run();
+</script>
diff --git a/pkg/shadow_dom/test/runner.min.html b/pkg/shadow_dom/test/runner.min.html
new file mode 100644
index 00000000000..6c45525be99
--- /dev/null
+++ b/pkg/shadow_dom/test/runner.min.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<!--
+Copyright 2012 The Polymer Authors. All rights reserved.
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file.
+-->
+<meta charset="utf-8">
+<link rel="stylesheet" href="../tool/node_modules/mocha/mocha.css">
+<script src="../tool/node_modules/chai/chai.js"></script>
+<script src="../tool/node_modules/mocha/mocha.js"></script>
+<script src="../tools/test/mocha-htmltest.js"></script>
+<script src="../tool/shadowdom.min.js"></script>
+<script src="../../../third_party/polymer/ShadowDOM/test/test.main.js"></script>
+<div id="mocha"></div>
+<script>
+mocha.run();
+</script>
+
diff --git a/pkg/shadow_dom/tool/build/else.js b/pkg/shadow_dom/tool/build/else.js
new file mode 100644
index 00000000000..dacd7620661
--- /dev/null
+++ b/pkg/shadow_dom/tool/build/else.js
@@ -0,0 +1 @@
+} else {
\ No newline at end of file
diff --git a/pkg/shadow_dom/tool/build/end-if.js b/pkg/shadow_dom/tool/build/end-if.js
new file mode 100644
index 00000000000..ff30235f076
--- /dev/null
+++ b/pkg/shadow_dom/tool/build/end-if.js
@@ -0,0 +1 @@
+}
\ No newline at end of file
diff --git a/pkg/shadow_dom/tool/build/if-poly.js b/pkg/shadow_dom/tool/build/if-poly.js
new file mode 100644
index 00000000000..7503d653851
--- /dev/null
+++ b/pkg/shadow_dom/tool/build/if-poly.js
@@ -0,0 +1,3 @@
+if ((!HTMLElement.prototype.createShadowRoot &&
+    !HTMLElement.prototype.webkitCreateShadowRoot) ||
+    window.__forceShadowDomPolyfill) {
diff --git a/pkg/shadow_dom/tool/conf/karma.conf.js b/pkg/shadow_dom/tool/conf/karma.conf.js
new file mode 100644
index 00000000000..382e2c7796c
--- /dev/null
+++ b/pkg/shadow_dom/tool/conf/karma.conf.js
@@ -0,0 +1,89 @@
+// Sample Karma configuration file, that contain pretty much all the available options
+// It's used for running client tests on Travis (http://travis-ci.org/#!/karma-runner/karma)
+// Most of the options can be overriden by cli arguments (see karma --help)
+//
+// For all available config options and default values, see:
+// https://github.com/karma-runner/karma/blob/stable/lib/config.js#L54
+
+
+// base path, that will be used to resolve files and exclude
+basePath = '../';
+
+// list of files / patterns to load in the browser
+files = [
+  'tools/test/mocha-htmltest.js',
+  'conf/mocha.conf.js',
+  'node_modules/chai/chai.js',
+  'shadowdom.js',
+  'test/test.main.js',
+  {pattern: 'src/**/*.js', included: false},
+  {pattern: 'test/**/*.js', included: false},
+  {pattern: 'test/**/*.html', included: false},
+  {pattern: 'tools/**/*.js', included: false}
+];
+
+// list of files to exclude
+exclude = [];
+
+frameworks = ['mocha'];
+
+// use dots reporter, as travis terminal does not support escaping sequences
+// possible values: 'dots', 'progress', 'junit', 'teamcity'
+// CLI --reporters progress
+reporters = ['progress'];
+
+// web server port
+// CLI --port 9876
+port = 9876;
+
+// cli runner port
+// CLI --runner-port 9100
+runnerPort = 9100;
+
+// enable / disable colors in the output (reporters and logs)
+// CLI --colors --no-colors
+colors = true;
+
+// level of logging
+// possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
+// CLI --log-level debug
+logLevel = LOG_INFO;
+
+// enable / disable watching file and executing tests whenever any file changes
+// CLI --auto-watch --no-auto-watch
+autoWatch = true;
+
+// Start these browsers, currently available:
+// - Chrome
+// - ChromeCanary
+// - Firefox
+// - Opera
+// - Safari (only Mac)
+// - PhantomJS
+// - IE (only Windows)
+// CLI --browsers Chrome,Firefox,Safari
+browsers = ['ChromeCanary'];
+
+// If browser does not capture in given timeout [ms], kill it
+// CLI --capture-timeout 5000
+captureTimeout = 50000;
+
+// Auto run tests on start (when browsers are captured) and exit
+// CLI --single-run --no-single-run
+singleRun = true;
+
+// report which specs are slower than 500ms
+// CLI --report-slower-than 500
+reportSlowerThan = 500;
+
+// compile coffee scripts
+preprocessors = {
+};
+
+plugins = [
+  'karma-mocha',
+  'karma-chrome-launcher',
+  'karma-firefox-launcher',
+  'karma-script-launcher',
+  'karma-crbot-reporter'
+]
diff --git a/pkg/shadow_dom/tool/conf/mocha.conf.js b/pkg/shadow_dom/tool/conf/mocha.conf.js
new file mode 100644
index 00000000000..11dd0d62d01
--- /dev/null
+++ b/pkg/shadow_dom/tool/conf/mocha.conf.js
@@ -0,0 +1 @@
+mocha.setup({ui:'tdd',htmlbase: '/base/test/'});
diff --git a/pkg/shadow_dom/tool/gruntfile.js b/pkg/shadow_dom/tool/gruntfile.js
new file mode 100644
index 00000000000..f245d730352
--- /dev/null
+++ b/pkg/shadow_dom/tool/gruntfile.js
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2013 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+module.exports = function(grunt) {
+  ShadowDOMPolyfill = [
+    'sidetable.js',
+    'wrappers.js',
+    'wrappers/events.js',
+    'wrappers/NodeList.js',
+    'wrappers/Node.js',
+    'querySelector.js',
+    'wrappers/node-interfaces.js',
+    'wrappers/CharacterData.js',
+    'wrappers/Element.js',
+    'wrappers/HTMLElement.js',
+    'wrappers/HTMLContentElement.js',
+    'wrappers/HTMLShadowElement.js',
+    'wrappers/HTMLTemplateElement.js',
+    'wrappers/HTMLUnknownElement.js',
+    'wrappers/generic.js',
+    'wrappers/ShadowRoot.js',
+    'ShadowRenderer.js',
+    'wrappers/Document.js',
+    'wrappers/Window.js',
+    'wrappers/MutationObserver.js',
+    'wrappers/override-constructors.js'
+  ];
+  ShadowDOMPolyfill = ShadowDOMPolyfill.map(function(p) {
+    return '../../../third_party/polymer/ShadowDOM/src/' + p;
+  });
+
+  // Apply partial patch from Polymer/Platform, dart2js, CSS
+  // polyfill from platform and dart2js CSS patches:
+  ShadowDOMPolyfill.unshift(
+    '../lib/src/platform/patches-shadowdom-polyfill-before.js'
+    );
+  ShadowDOMPolyfill.push(
+    '../lib/src/platform/patches-shadowdom-polyfill.js',
+    '../lib/src/platform/platform-init.js',
+    '../lib/src/platform/ShadowCSS.js',
+    '../lib/src/platform/patches-shadow-css.js'
+    );
+
+  // Only load polyfill if not natively present.
+  ConditionalShadowDOM = [].concat(
+    'build/if-poly.js',
+    ShadowDOMPolyfill,
+    'build/end-if.js'
+  );
+
+  // karma setup
+  var browsers;
+  (function() {
+    try {
+      var config = grunt.file.readJSON('local.json');
+      if (config.browsers) {
+        browsers = config.browsers;
+      }
+    } catch (e) {
+      var os = require('os');
+      browsers = ['Chrome', 'Firefox'];
+      if (os.type() === 'Darwin') {
+        browsers.push('ChromeCanary');
+      }
+      if (os.type() === 'Windows_NT') {
+        browsers.push('IE');
+      }
+    }
+  })();
+  grunt.initConfig({
+    karma: {
+      options: {
+        configFile: 'conf/karma.conf.js',
+        keepalive: true,
+        browsers: browsers
+      },
+      buildbot: {
+        browsers: browsers,
+        reporters: ['crbot'],
+        logLevel: 'OFF'
+      },
+      ShadowDOM: {
+        browsers: browsers
+      }
+    },
+    concat: {
+      ShadowDOM: {
+        src: ConditionalShadowDOM,
+        dest: '../lib/shadow_dom.debug.js',
+        nonull: true
+      }
+    },
+    uglify: {
+      ShadowDOM: {
+        options: {
+          compress: {
+            // TODO(sjmiles): should be false by default (?)
+            // https://github.com/mishoo/UglifyJS2/issues/165
+            unsafe: false
+          }
+          //compress: true, Xmangle: true, beautify: true, unsafe: false
+        },
+        files: {
+          '../lib/shadow_dom.min.js': ['../lib/shadow_dom.debug.js']
+        }
+      }
+    },
+
+    yuidoc: {
+      compile: {
+        name: '<%= pkg.name %>',
+        description: '<%= pkg.description %>',
+        version: '<%= pkg.version %>',
+        url: '<%= pkg.homepage %>',
+        options: {
+          exclude: 'third_party',
+          paths: '.',
+          outdir: 'docs',
+          linkNatives: 'true',
+          tabtospace: 2,
+          themedir: '../docs/doc_themes/simple'
+        }
+      }
+    },
+    pkg: grunt.file.readJSON('package.json')
+  });
+
+  // plugins
+  grunt.loadNpmTasks('grunt-contrib-concat');
+  grunt.loadNpmTasks('grunt-contrib-uglify');
+  grunt.loadNpmTasks('grunt-contrib-yuidoc');
+  grunt.loadNpmTasks('grunt-karma-0.9.1');
+
+  // tasks
+  grunt.registerTask('default', ['concat', 'uglify']);
+  grunt.registerTask('minify', ['concat', 'uglify']);
+  grunt.registerTask('docs', ['yuidoc']);
+  grunt.registerTask('test', ['karma:ShadowDOM']);
+  grunt.registerTask('test-buildbot', ['karma:buildbot']);
+};
+
diff --git a/pkg/shadow_dom/tool/package.json b/pkg/shadow_dom/tool/package.json
new file mode 100644
index 00000000000..766ca2812b6
--- /dev/null
+++ b/pkg/shadow_dom/tool/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "ShadowDOM",
+  "version": "0.0.1",
+  "devDependencies": {
+    "mocha": ">=1.9",
+    "chai": "*",
+    "grunt": "*",
+    "grunt-contrib-concat": "*",
+    "grunt-contrib-uglify": "*",
+    "grunt-contrib-yuidoc": "~0.4.0",
+    "grunt-karma-0.9.1": "~0.4.3",
+    "karma-mocha": "*",
+    "karma-script-launcher": "*",
+    "karma-crbot-reporter": "*"
+  }
+}
diff --git a/pkg/shadow_dom/tool/play.html b/pkg/shadow_dom/tool/play.html
new file mode 100644
index 00000000000..f17b4710d59
--- /dev/null
+++ b/pkg/shadow_dom/tool/play.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<!--
+Copyright 2012 The Polymer Authors. All rights reserved.
+Use of this source code is goverened by a BSD-style
+license that can be found in the LICENSE file.
+-->
+<meta charset="utf-8">
+<script src="shadowdom.js"></script>
+<style>
+
+.el,
+.sr {
+  height: 300px;
+  width: 300px;
+}
+
+</style>
+<textarea class="el" placeholder="Element host"></textarea>
+<textarea class="sr" placeholder="Shadow Root"></textarea>
+<button onclick="update()">Update</button>
+
+<div class="test">Real</div>
+
+<script>
+
+var el = document.querySelector('.test');
+var sr = el.createShadowRoot();
+
+sr.innerHTML = 'Before <content></content> After';
+
+function update() {
+  el.innerHTML = document.querySelector('.el').value;
+  sr.innerHTML = document.querySelector('.sr').value;
+}
+
+document.querySelector('.el').value = el.innerHTML;
+document.querySelector('.sr').value = sr.innerHTML;
+
+</script>
diff --git a/pkg/shadow_dom/tool/readme.txt b/pkg/shadow_dom/tool/readme.txt
new file mode 100644
index 00000000000..829c6978294
--- /dev/null
+++ b/pkg/shadow_dom/tool/readme.txt
@@ -0,0 +1,18 @@
+How to build shadow_dom package:
+
+- Install nodejs and npm
+     sudo apt-get install nodejs
+     sudo apt-get install npm
+- Install grunt http://gruntjs.com/getting-started
+
+- Change to the shadow_dom tool directory
+     cd pkg/shadow_dom/tool
+
+- Install project dependencies
+     npm install
+
+- Run grunt to generate the shadow_dom packages in pkg/shadow_dom/lib
+     grunt
+
+
+
diff --git a/pkg/shadow_dom/tool/shadowdom.js b/pkg/shadow_dom/tool/shadowdom.js
new file mode 100644
index 00000000000..91f58197c17
--- /dev/null
+++ b/pkg/shadow_dom/tool/shadowdom.js
@@ -0,0 +1,44 @@
+// Copyright 2013 The Polymer Authors. All rights reserved.
+// Use of this source code is goverened by a BSD-style
+// license that can be found in the LICENSE file.
+
+(function() {
+  var thisFile = 'shadowdom.js';
+  var base = '';
+  Array.prototype.forEach.call(document.querySelectorAll('script[src]'), function(s) {
+    var src = s.getAttribute('src');
+    var re = new RegExp(thisFile + '[^\\\\]*');
+    var match = src.match(re);
+    if (match) {
+      base = src.slice(0, -match[0].length);
+    }
+  });
+  base += '../../../third_party/polymer/ShadowDOM/src/';
+
+  [
+    'sidetable.js',
+    'wrappers.js',
+    'wrappers/events.js',
+    'wrappers/NodeList.js',
+    'wrappers/Node.js',
+    'querySelector.js',
+    'wrappers/node-interfaces.js',
+    'wrappers/CharacterData.js',
+    'wrappers/Element.js',
+    'wrappers/HTMLElement.js',
+    'wrappers/HTMLContentElement.js',
+    'wrappers/HTMLShadowElement.js',
+    'wrappers/HTMLTemplateElement.js',
+    'wrappers/HTMLUnknownElement.js',
+    'wrappers/generic.js',
+    'wrappers/ShadowRoot.js',
+    'ShadowRenderer.js',
+    'wrappers/Document.js',
+    'wrappers/Window.js',
+    'wrappers/MutationObserver.js',
+    'wrappers/override-constructors.js'
+  ].forEach(function(src) {
+    document.write('<script src="' + base + src + '"></script>');
+  });
+
+})();