diff --git a/sdk/lib/chrome/dart2js/chrome_dart2js.dart b/sdk/lib/_chrome/dart2js/chrome_dart2js.dart
similarity index 99%
rename from sdk/lib/chrome/dart2js/chrome_dart2js.dart
rename to sdk/lib/_chrome/dart2js/chrome_dart2js.dart
index 77338a8c306..93f8f752c59 100644
--- a/sdk/lib/chrome/dart2js/chrome_dart2js.dart
+++ b/sdk/lib/_chrome/dart2js/chrome_dart2js.dart
@@ -5,7 +5,7 @@
 ///
 /// For more information on these APIs, see the
 /// [chrome.* API documentation](http://developer.chrome.com/apps/api_index.html).
-library chrome;
+library _chrome;
 
 import 'dart:_foreign_helper' show JS;
 import 'dart:_js_helper';
@@ -17,7 +17,7 @@ import 'dart:html';
 // BSD-style license that can be found in the LICENSE file.
 
 // DO NOT EDIT
-// Auto-generated dart:chrome library.
+// Auto-generated dart:_chrome library.
 
 
 /* TODO(sashab): Add "show convertDartClosureToJS" once 'show' works. */
diff --git a/sdk/lib/chrome/dartium/chrome_dartium.dart b/sdk/lib/_chrome/dartium/chrome_dartium.dart
similarity index 90%
rename from sdk/lib/chrome/dartium/chrome_dartium.dart
rename to sdk/lib/_chrome/dartium/chrome_dartium.dart
index b741b3b7d1a..c16c9e5f71e 100644
--- a/sdk/lib/chrome/dartium/chrome_dartium.dart
+++ b/sdk/lib/_chrome/dartium/chrome_dartium.dart
@@ -5,12 +5,12 @@
 ///
 /// For more information on these APIs, see the
 /// [Chrome APIs Documentation](http://developer.chrome.com/extensions/api_index.html)
-library chrome;
+library _chrome;
 
 // 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.
 
 // DO NOT EDIT
-// Auto-generated dart:chrome library.
+// Auto-generated dart:_chrome library.
 
diff --git a/sdk/lib/_internal/libraries.dart b/sdk/lib/_internal/libraries.dart
index fee473ed3ea..8da7a8ce3d8 100644
--- a/sdk/lib/_internal/libraries.dart
+++ b/sdk/lib/_internal/libraries.dart
@@ -27,9 +27,9 @@ const Map<String, LibraryInfo> LIBRARIES = const {
       maturity: Maturity.STABLE,
       dart2jsPatchPath: "_internal/lib/async_patch.dart"),
 
-  "chrome": const LibraryInfo(
-      "chrome/dart2js/chrome_dart2js.dart",
-      maturity: Maturity.DEPRECATED,
+  "_chrome": const LibraryInfo(
+      "_chrome/dart2js/chrome_dart2js.dart",
+      documented: false,
       category: "Client"),
 
   "collection": const LibraryInfo(
diff --git a/tests/chrome/chrome.status b/tests/_chrome/_chrome.status
similarity index 100%
rename from tests/chrome/chrome.status
rename to tests/_chrome/_chrome.status
diff --git a/tests/chrome/sample_test.dart b/tests/_chrome/sample_test.dart
similarity index 76%
rename from tests/chrome/sample_test.dart
rename to tests/_chrome/sample_test.dart
index 219a6007415..eb51d5cd65d 100644
--- a/tests/chrome/sample_test.dart
+++ b/tests/_chrome/sample_test.dart
@@ -5,19 +5,19 @@
 library sample_test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
-import 'dart:chrome' as chrome;
+import 'dart:_chrome' as _chrome;
 
 main() {
   useHtmlConfiguration();
   test('access', () {
-    var window = chrome.app.window;
-    expect(window is chrome.WindowModule, true);
+    var window = _chrome.app.window;
+    expect(window is _chrome.WindowModule, true);
   });
 
   test('fails from browser', () {
     // APIs should not work in standard browser apps.
     expect(() {
-      chrome.app.window.create('foo.html');
+      _chrome.app.window.create('foo.html');
     }, throws);
   });
 }
diff --git a/tools/create_sdk.py b/tools/create_sdk.py
index ecba37c724c..f70bdfcc7d1 100755
--- a/tools/create_sdk.py
+++ b/tools/create_sdk.py
@@ -194,13 +194,13 @@ def Main(argv):
 
   os.makedirs(join(LIB, 'html'))
 
-  for library in [join('_internal', 'compiler'),
+  for library in [join('_chrome', 'dart2js'), join('_chrome', 'dartium'),
+                  join('_internal', 'compiler'),
                   join('_internal', 'dartdoc'),
                   join('_internal', 'pub', 'resource'),
                   join('_internal', 'lib'),
                   'async', 'collection', '_collection_dev', 'convert',
                   'core', 'crypto', 'io', 'isolate',
-                  join('chrome', 'dart2js'), join('chrome', 'dartium'),
                   join('html', 'dart2js'), join('html', 'dartium'),
                   join('html', 'html_common'),
                   join('indexed_db', 'dart2js'), join('indexed_db', 'dartium'),
diff --git a/tools/dom/scripts/chromegenerator.py b/tools/dom/scripts/chromegenerator.py
index 73d504c8dd5..e537c85bc03 100755
--- a/tools/dom/scripts/chromegenerator.py
+++ b/tools/dom/scripts/chromegenerator.py
@@ -17,10 +17,10 @@ COMPILER = "../../../third_party/chrome/tools/json_schema_compiler/compiler.py"
 API_DIR = "../../../third_party/chrome/idl/"
 
 # The path to the custom overrides directory, containing override files.
-OVERRIDES_DIR = "../src/chrome/custom_dart/"
+OVERRIDES_DIR = "../src/_chrome/custom_dart/"
 
 # The path to where the generated .dart files should be saved.
-OUTPUT_DIR = "../src/chrome/"
+OUTPUT_DIR = "../src/_chrome/"
 
 # The path to where the output template file is. This file will be populated
 # with TEMPLATE_CONTENT, followed by the list of generated .dart files.
@@ -34,7 +34,7 @@ TEMPLATE_CONTENT = """
 // BSD-style license that can be found in the LICENSE file.
 
 // DO NOT EDIT
-// Auto-generated dart:chrome library.
+// Auto-generated dart:_chrome library.
 
 /// Native wrappers for the Chrome packaged app APIs.
 ///
@@ -43,7 +43,7 @@ TEMPLATE_CONTENT = """
 ///
 /// For more information on these APIs, see the
 /// [chrome.* API documentation](http://developer.chrome.com/apps/api_index.html).
-library chrome;
+library _chrome;
 
 import 'dart:_foreign_helper' show JS;
 /* TODO(sashab): Add "show convertDartClosureToJS" once 'show' works. */
@@ -51,15 +51,15 @@ import 'dart:_js_helper';
 import 'dart:html_common';
 import 'dart:html';
 
-part "$AUXILIARY_DIR/chrome/utils.dart";
-part "$AUXILIARY_DIR/chrome/chrome.dart";
+part "$AUXILIARY_DIR/_chrome/utils.dart";
+part "$AUXILIARY_DIR/_chrome/_chrome.dart";
 
 // Generated files below this line.
 """
 
 # The format for adding files to TEMPLATE_CONTENT. Will be substituted with the
 # filename (not including the extension) of the IDL/JSON file.
-TEMPLATE_FILE_FORMAT = 'part "$AUXILIARY_DIR/chrome/%s.dart";'
+TEMPLATE_FILE_FORMAT = 'part "$AUXILIARY_DIR/_chrome/%s.dart";'
 
 # A list of schema files to generate.
 # TODO(sashab): Later, use the ones from API_DIR/api.gyp and
diff --git a/tools/dom/src/chrome/app_runtime.dart b/tools/dom/src/_chrome/app_runtime.dart
similarity index 100%
rename from tools/dom/src/chrome/app_runtime.dart
rename to tools/dom/src/_chrome/app_runtime.dart
diff --git a/tools/dom/src/chrome/app_window.dart b/tools/dom/src/_chrome/app_window.dart
similarity index 100%
rename from tools/dom/src/chrome/app_window.dart
rename to tools/dom/src/_chrome/app_window.dart
diff --git a/tools/dom/src/chrome/chrome.dart b/tools/dom/src/_chrome/chrome.dart
similarity index 100%
rename from tools/dom/src/chrome/chrome.dart
rename to tools/dom/src/_chrome/chrome.dart
diff --git a/tools/dom/src/chrome/custom_dart/app_window.AppWindow.contentWindow.dart b/tools/dom/src/_chrome/custom_dart/app_window.AppWindow.contentWindow.dart
similarity index 100%
rename from tools/dom/src/chrome/custom_dart/app_window.AppWindow.contentWindow.dart
rename to tools/dom/src/_chrome/custom_dart/app_window.AppWindow.contentWindow.dart
diff --git a/tools/dom/src/chrome/custom_dart/app_window.AppWindow.getBounds.dart b/tools/dom/src/_chrome/custom_dart/app_window.AppWindow.getBounds.dart
similarity index 100%
rename from tools/dom/src/chrome/custom_dart/app_window.AppWindow.getBounds.dart
rename to tools/dom/src/_chrome/custom_dart/app_window.AppWindow.getBounds.dart
diff --git a/tools/dom/src/chrome/custom_dart/app_window.create.dart b/tools/dom/src/_chrome/custom_dart/app_window.create.dart
similarity index 100%
rename from tools/dom/src/chrome/custom_dart/app_window.create.dart
rename to tools/dom/src/_chrome/custom_dart/app_window.create.dart
diff --git a/tools/dom/src/chrome/custom_dart/app_window.current.dart b/tools/dom/src/_chrome/custom_dart/app_window.current.dart
similarity index 100%
rename from tools/dom/src/chrome/custom_dart/app_window.current.dart
rename to tools/dom/src/_chrome/custom_dart/app_window.current.dart
diff --git a/tools/dom/src/chrome/file_system.dart b/tools/dom/src/_chrome/file_system.dart
similarity index 100%
rename from tools/dom/src/chrome/file_system.dart
rename to tools/dom/src/_chrome/file_system.dart
diff --git a/tools/dom/src/chrome/utils.dart b/tools/dom/src/_chrome/utils.dart
similarity index 100%
rename from tools/dom/src/chrome/utils.dart
rename to tools/dom/src/_chrome/utils.dart
diff --git a/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate b/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
index 2ea934d250f..8cfc7a3aa98 100644
--- a/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
@@ -21,10 +21,10 @@ import 'dart:_js_helper';
 import 'dart:html_common';
 import 'dart:html';
 
-part "$AUXILIARY_DIR/chrome/utils.dart";
-part "$AUXILIARY_DIR/chrome/chrome.dart";
+part "$AUXILIARY_DIR/_chrome/utils.dart";
+part "$AUXILIARY_DIR/_chrome/_chrome.dart";
 
 // Generated files below this line.
-part "$AUXILIARY_DIR/chrome/app_window.dart";
-part "$AUXILIARY_DIR/chrome/app_runtime.dart";
-part "$AUXILIARY_DIR/chrome/file_system.dart";
\ No newline at end of file
+part "$AUXILIARY_DIR/_chrome/app_window.dart";
+part "$AUXILIARY_DIR/_chrome/app_runtime.dart";
+part "$AUXILIARY_DIR/_chrome/file_system.dart";
diff --git a/tools/dom/templates/html/dartium/chrome_dartium.darttemplate b/tools/dom/templates/html/dartium/chrome_dartium.darttemplate
index 03a6cb49788..cc513c75aa4 100644
--- a/tools/dom/templates/html/dartium/chrome_dartium.darttemplate
+++ b/tools/dom/templates/html/dartium/chrome_dartium.darttemplate
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // DO NOT EDIT
-// Auto-generated dart:chrome library.
+// Auto-generated dart:_chrome library.
 
 /// Native wrappers for the Chrome Packaged App APIs.
 ///
@@ -12,4 +12,4 @@
 ///
 /// For more information on these APIs, see the
 /// [Chrome APIs Documentation](http://developer.chrome.com/extensions/api_index.html)
-library chrome;
+library _chrome;