diff --git a/runtime/bin/dartutils.cc b/runtime/bin/dartutils.cc
index d29c947deb5..08a8452eba3 100644
--- a/runtime/bin/dartutils.cc
+++ b/runtime/bin/dartutils.cc
@@ -233,6 +233,16 @@ const char* DartUtils::RemoveScheme(const char* url) {
 }
 
 
+char* DartUtils::DirName(const char* url) {
+  const char* slash = strrchr(url, File::PathSeparator()[0]);
+  if (slash == NULL) {
+    return strdup(url);
+  } else {
+    return strndup(url, slash - url + 1);
+  }
+}
+
+
 void* DartUtils::OpenFile(const char* name, bool write) {
   File* file = File::Open(name, write ? File::kWriteTruncate : File::kRead);
   return reinterpret_cast<void*>(file);
diff --git a/runtime/bin/dartutils.h b/runtime/bin/dartutils.h
index f8ad050c34c..9cbebf65260 100644
--- a/runtime/bin/dartutils.h
+++ b/runtime/bin/dartutils.h
@@ -126,6 +126,7 @@ class DartUtils {
   static bool IsDartBuiltinLibURL(const char* url_name);
   static bool IsHttpSchemeURL(const char* url_name);
   static const char* RemoveScheme(const char* url);
+  static char* DirName(const char* url);
   static void* MapExecutable(const char* name, intptr_t* file_len);
   static void* OpenFile(const char* name, bool write);
   static void ReadFile(const uint8_t** data, intptr_t* file_len, void* stream);
diff --git a/runtime/bin/loader.cc b/runtime/bin/loader.cc
index a7d99ccdd46..c94a21f0307 100644
--- a/runtime/bin/loader.cc
+++ b/runtime/bin/loader.cc
@@ -11,6 +11,7 @@
 #include "bin/file.h"
 #include "bin/lockers.h"
 #include "bin/utils.h"
+#include "include/dart_tools_api.h"
 
 namespace dart {
 namespace bin {
@@ -353,6 +354,7 @@ bool Loader::ProcessResultLocked(Loader* loader, Loader::IOResult* result) {
   loader->monitor_->Exit();
 
   Dart_Handle dart_result = Dart_Null();
+  bool reload_extensions = false;
 
   switch (tag) {
     case Dart_kImportTag:
@@ -367,6 +369,7 @@ bool Loader::ProcessResultLocked(Loader* loader, Loader::IOResult* result) {
     case Dart_kScriptTag:
       if (payload_type == DartUtils::kSnapshotMagicNumber) {
         dart_result = Dart_LoadScriptFromSnapshot(payload, payload_length);
+        reload_extensions = true;
       } else if (payload_type == DartUtils::kKernelMagicNumber) {
         dart_result = Dart_LoadKernel(payload, payload_length);
       } else {
@@ -385,6 +388,15 @@ bool Loader::ProcessResultLocked(Loader* loader, Loader::IOResult* result) {
     return false;
   }
 
+  if (reload_extensions) {
+    dart_result = ReloadNativeExtensions();
+    if (Dart_IsError(dart_result)) {
+      // Remember the error if we encountered one.
+      loader->error_ = dart_result;
+      return false;
+    }
+  }
+
   return true;
 }
 
@@ -437,6 +449,51 @@ void Loader::InitForSnapshot(const char* snapshot_uri) {
 }
 
 
+#define RETURN_ERROR(result) \
+  if (Dart_IsError(result)) return result;
+
+Dart_Handle Loader::ReloadNativeExtensions() {
+  Dart_Handle scheme =
+      Dart_NewStringFromCString(DartUtils::kDartExtensionScheme);
+  Dart_Handle extension_imports = Dart_GetImportsOfScheme(scheme);
+  RETURN_ERROR(extension_imports);
+
+  intptr_t length = -1;
+  Dart_Handle result = Dart_ListLength(extension_imports, &length);
+  RETURN_ERROR(result);
+  Dart_Handle* import_handles = reinterpret_cast<Dart_Handle*>(
+      Dart_ScopeAllocate(sizeof(Dart_Handle) * length));
+  result = Dart_ListGetRange(extension_imports, 0, length, import_handles);
+  RETURN_ERROR(result);
+  for (intptr_t i = 0; i < length; i += 2) {
+    Dart_Handle importer = import_handles[i];
+    Dart_Handle importee = import_handles[i + 1];
+
+    const char* extension_uri = NULL;
+    result = Dart_StringToCString(Dart_LibraryUrl(importee), &extension_uri);
+    RETURN_ERROR(result);
+    const char* extension_path = DartUtils::RemoveScheme(extension_uri);
+
+    const char* lib_uri = NULL;
+    result = Dart_StringToCString(Dart_LibraryUrl(importer), &lib_uri);
+    RETURN_ERROR(result);
+
+    char* lib_path = NULL;
+    if (strncmp(lib_uri, "file://", 7) == 0) {
+      lib_path = DartUtils::DirName(DartUtils::RemoveScheme(lib_uri));
+    } else {
+      lib_path = strdup(lib_uri);
+    }
+
+    result = Extensions::LoadExtension(lib_path, extension_path, importer);
+    free(lib_path);
+    RETURN_ERROR(result);
+  }
+
+  return Dart_True();
+}
+
+
 Dart_Handle Loader::LoadUrlContents(Dart_Handle url,
                                     uint8_t** payload,
                                     intptr_t* payload_length) {
diff --git a/runtime/bin/loader.h b/runtime/bin/loader.h
index ac9bc45f7d5..2076be8b313 100644
--- a/runtime/bin/loader.h
+++ b/runtime/bin/loader.h
@@ -22,6 +22,8 @@ class Loader {
 
   static void InitForSnapshot(const char* snapshot_uri);
 
+  static Dart_Handle ReloadNativeExtensions();
+
   // Loads contents of the specified url.
   static Dart_Handle LoadUrlContents(Dart_Handle url,
                                      uint8_t** payload,
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index bd1e6affac4..b481a67980e 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -815,6 +815,10 @@ static Dart_Isolate CreateIsolateAndSetupHelper(const char* script_uri,
     Builtin::SetNativeResolver(Builtin::kBuiltinLibrary);
     Builtin::SetNativeResolver(Builtin::kIOLibrary);
   }
+  if (run_app_snapshot) {
+    Dart_Handle result = Loader::ReloadNativeExtensions();
+    CHECK_RESULT(result);
+  }
 
   // Set up the library tag handler for this isolate.
   Dart_Handle result = Dart_SetLibraryTagHandler(Loader::LibraryTagHandler);
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index 2608724962e..bc60b3b006b 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -2940,6 +2940,19 @@ DART_EXPORT Dart_Handle Dart_LibraryImportLibrary(Dart_Handle library,
                                                   Dart_Handle import,
                                                   Dart_Handle prefix);
 
+
+/**
+ * Returns a flattened list of pairs. The first element in each pair is the
+ * importing library and and the second element is the imported library for each
+ * import in the isolate of a library whose URI's scheme is [scheme].
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to a list of flattened pairs of importer-importee.
+ */
+DART_EXPORT Dart_Handle Dart_GetImportsOfScheme(Dart_Handle scheme);
+
+
 /**
  * Called by the embedder to provide the source for a "part of"
  * directive.  This function should be called in response to a
diff --git a/runtime/observatory/lib/src/elements/library_view.dart b/runtime/observatory/lib/src/elements/library_view.dart
index 2265d1b487c..165ffc85ffb 100644
--- a/runtime/observatory/lib/src/elements/library_view.dart
+++ b/runtime/observatory/lib/src/elements/library_view.dart
@@ -156,7 +156,7 @@ class LibraryViewElement extends HtmlElement implements Renderable {
       new DivElement()
         ..classes = ['content-centered-big']
         ..children = [
-          new HeadingElement.h2()..text = 'ICData',
+          new HeadingElement.h2()..text = 'Library',
           new HRElement(),
           new ObjectCommonElement(_isolate, _library, _retainedSizes,
               _reachableSizes, _references, _retainingPaths, _instances,
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 343f5979e5e..e1c2acacbde 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -5718,6 +5718,42 @@ DART_EXPORT Dart_Handle Dart_LibraryImportLibrary(Dart_Handle library,
 }
 
 
+DART_EXPORT Dart_Handle Dart_GetImportsOfScheme(Dart_Handle scheme) {
+  DARTSCOPE(Thread::Current());
+  Isolate* I = T->isolate();
+  const String& scheme_vm = Api::UnwrapStringHandle(Z, scheme);
+  if (scheme_vm.IsNull()) {
+    RETURN_TYPE_ERROR(Z, scheme, String);
+  }
+
+  const GrowableObjectArray& libraries =
+      GrowableObjectArray::Handle(Z, I->object_store()->libraries());
+  const GrowableObjectArray& result =
+      GrowableObjectArray::Handle(Z, GrowableObjectArray::New());
+  Library& importer = Library::Handle(Z);
+  Array& imports = Array::Handle(Z);
+  Namespace& ns = Namespace::Handle(Z);
+  Library& importee = Library::Handle(Z);
+  String& importee_uri = String::Handle(Z);
+  for (intptr_t i = 0; i < libraries.Length(); i++) {
+    importer ^= libraries.At(i);
+    imports = importer.imports();
+    for (intptr_t j = 0; j < imports.Length(); j++) {
+      ns ^= imports.At(j);
+      if (ns.IsNull()) continue;
+      importee = ns.library();
+      importee_uri = importee.url();
+      if (importee_uri.StartsWith(scheme_vm)) {
+        result.Add(importer);
+        result.Add(importee);
+      }
+    }
+  }
+
+  return Api::NewHandle(T, Array::MakeArray(result));
+}
+
+
 DART_EXPORT Dart_Handle Dart_LoadSource(Dart_Handle library,
                                         Dart_Handle url,
                                         Dart_Handle resolved_url,
diff --git a/samples/sample_extension/test/sample_extension_app_snapshot_test.dart b/samples/sample_extension/test/sample_extension_app_snapshot_test.dart
new file mode 100644
index 00000000000..04193c98ce0
--- /dev/null
+++ b/samples/sample_extension/test/sample_extension_app_snapshot_test.dart
@@ -0,0 +1,11 @@
+// Copyright (c) 2016, 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.
+//
+// Dart test program for testing native extensions.
+
+import 'sample_extension_test_helper.dart';
+
+void main() {
+  testNativeExtensions("app-jit");
+}
diff --git a/samples/sample_extension/test/sample_extension_script_snapshot_test.dart b/samples/sample_extension/test/sample_extension_script_snapshot_test.dart
new file mode 100644
index 00000000000..31b9e03fc53
--- /dev/null
+++ b/samples/sample_extension/test/sample_extension_script_snapshot_test.dart
@@ -0,0 +1,11 @@
+// Copyright (c) 2016, 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.
+//
+// Dart test program for testing native extensions.
+
+import 'sample_extension_test_helper.dart';
+
+void main() {
+  testNativeExtensions("script");
+}
diff --git a/samples/sample_extension/test/sample_extension_test.dart b/samples/sample_extension/test/sample_extension_test.dart
index 9c0a42d3046..4311ff544f7 100644
--- a/samples/sample_extension/test/sample_extension_test.dart
+++ b/samples/sample_extension/test/sample_extension_test.dart
@@ -1,72 +1,11 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 //
 // Dart test program for testing native extensions.
 
-import 'dart:async';
-import 'dart:io';
-import 'dart:isolate';
-
-import "package:expect/expect.dart";
-import "package:path/path.dart";
-
-Future copyFileToDirectory(String file, String directory) {
-  String src = file;
-  String dst = directory;
-  switch (Platform.operatingSystem) {
-    case 'linux':
-    case 'macos':
-      return Process.run('cp', [src, dst]);
-    case 'windows':
-      return Process.run('cmd.exe', ['/C', 'copy $src $dst']);
-    default:
-      Expect.fail('Unknown operating system ${Platform.operatingSystem}');
-  }
-}
-
-String getNativeLibraryPath(String buildDirectory) {
-  switch (Platform.operatingSystem) {
-    case 'linux':
-      return join(buildDirectory, 'lib.target', 'libsample_extension.so');
-    case 'macos':
-      return join(buildDirectory, 'libsample_extension.dylib');
-    case 'windows':
-      return join(buildDirectory, 'sample_extension.dll');
-    default:
-      Expect.fail('Unknown operating system ${Platform.operatingSystem}');
-  }
-}
+import 'sample_extension_test_helper.dart';
 
 void main() {
-  String buildDirectory = dirname(Platform.executable);
-  Directory tempDirectory =
-      Directory.systemTemp.createTempSync('sample_extension_');
-  String testDirectory = tempDirectory.path;
-  String sourceDirectory = Platform.script.resolve('..').toFilePath();
-
-  // Copy sample_extension shared library, sample_extension dart files and
-  // sample_extension tests to the temporary test directory.
-  copyFileToDirectory(getNativeLibraryPath(buildDirectory), testDirectory)
-  .then((_) => Future.forEach(['sample_synchronous_extension.dart',
-                               'sample_asynchronous_extension.dart',
-                               'test_sample_synchronous_extension.dart',
-                               'test_sample_asynchronous_extension.dart'],
-    (file) => copyFileToDirectory(join(sourceDirectory, file), testDirectory)
-  ))
-
-  .then((_) => Future.forEach(['test_sample_synchronous_extension.dart',
-                               'test_sample_asynchronous_extension.dart'],
-    (test) => Process.run(Platform.executable, [join(testDirectory, test)])
-    .then((ProcessResult result) {
-      if (result.exitCode != 0) {
-        print('Failing test: ${join(sourceDirectory, test)}');
-        print('Failing process stdout: ${result.stdout}');
-        print('Failing process stderr: ${result.stderr}');
-        print('End failing process stderr');
-        Expect.fail('Test failed with exit code ${result.exitCode}');
-      }
-    })
-  ))
-  .whenComplete(() => tempDirectory.deleteSync(recursive: true));
+  testNativeExtensions(null /* no snapshot */);
 }
diff --git a/samples/sample_extension/test/sample_extension_test_helper.dart b/samples/sample_extension/test/sample_extension_test_helper.dart
new file mode 100644
index 00000000000..e1c1faa0aa5
--- /dev/null
+++ b/samples/sample_extension/test/sample_extension_test_helper.dart
@@ -0,0 +1,90 @@
+// 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.
+//
+// Dart test program for testing native extensions.
+
+import 'dart:async';
+import 'dart:io';
+import 'dart:isolate';
+
+import "package:expect/expect.dart";
+import "package:path/path.dart";
+
+Future copyFileToDirectory(String file, String directory) {
+  String src = file;
+  String dst = directory;
+  switch (Platform.operatingSystem) {
+    case 'linux':
+    case 'macos':
+      return Process.run('cp', [src, dst]);
+    case 'windows':
+      return Process.run('cmd.exe', ['/C', 'copy $src $dst']);
+    default:
+      Expect.fail('Unknown operating system ${Platform.operatingSystem}');
+  }
+}
+
+String getNativeLibraryPath(String buildDirectory) {
+  switch (Platform.operatingSystem) {
+    case 'linux':
+      return join(buildDirectory, 'lib.target', 'libsample_extension.so');
+    case 'macos':
+      return join(buildDirectory, 'libsample_extension.dylib');
+    case 'windows':
+      return join(buildDirectory, 'sample_extension.dll');
+    default:
+      Expect.fail('Unknown operating system ${Platform.operatingSystem}');
+  }
+}
+
+Future run(String program, List arguments) async {
+  print("+ $program ${arguments.join(' ')}");
+  ProcessResult result = await Process.run(program, arguments);
+  if (result.exitCode != 0) {
+    print('Failing process stdout: ${result.stdout}');
+    print('Failing process stderr: ${result.stderr}');
+    print('End failing process stderr');
+    Expect.fail('Test failed with exit code ${result.exitCode}');
+  }
+}
+
+Future testNativeExtensions(String snapshotKind) async {
+  String buildDirectory = dirname(Platform.executable);
+  Directory tempDirectory =
+      Directory.systemTemp.createTempSync('sample_extension_');
+  try {
+    String testDirectory = tempDirectory.path;
+    String sourceDirectory = Platform.script.resolve('..').toFilePath();
+
+    // Copy sample_extension shared library, sample_extension dart files and
+    // sample_extension tests to the temporary test directory.
+    await copyFileToDirectory(getNativeLibraryPath(buildDirectory),
+                              testDirectory);
+    for (var file in ['sample_synchronous_extension.dart',
+                      'sample_asynchronous_extension.dart',
+                      'test_sample_synchronous_extension.dart',
+                      'test_sample_asynchronous_extension.dart']) {
+      await copyFileToDirectory(join(sourceDirectory, file), testDirectory);
+    }
+
+    for (var test in ['test_sample_synchronous_extension.dart',
+                      'test_sample_asynchronous_extension.dart']) {
+      String script = join(testDirectory, test);
+      String snapshot;
+      if (snapshotKind == null) {
+        snapshot = script;
+      } else {
+        snapshot = join(testDirectory, "$test.snapshot");
+        await run(Platform.executable,
+                  ['--snapshot=$snapshot',
+                   '--snapshot-kind=$snapshotKind',
+                   script]);
+      }
+
+      await run(Platform.executable, [snapshot]);
+    }
+  } finally {
+    await tempDirectory.deleteSync(recursive: true);
+  }
+}
diff --git a/samples/samples.status b/samples/samples.status
index c01c0d9540f..02b193fc87f 100644
--- a/samples/samples.status
+++ b/samples/samples.status
@@ -19,10 +19,7 @@ sample_extension: Crash # Unable to compile UnsupportedError.message.
 build_dart: Skip
 
 [ $arch == arm ]
-sample_extension/test/sample_extension_test: Skip # Issue 14705
-
-[ $arch == simarm64 ]
-*: Skip
+sample_extension/test/*: Skip # Issue 14705
 
 [ $noopt || $runtime == dart_precompiled || $runtime == dart_app ]
 sample_extension: Skip # Platform.executable