Merge request - fixes dart2js async problems.

sdk/lib/_internal/libraries.dart

 // Copyright (c) 2012, 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.
 
 library libraries;
 
 /**
  * A bit flag used by [LibraryInfo] indicating that a library is used by dart2js
  */
 const int DART2JS_PLATFORM = 1;
@@ skipping 193 matching lines @@
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
 
   "_js_embedded_names": const LibraryInfo(
       "_internal/compiler/js_lib/shared/embedded_names.dart",
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
 
+  "_async_await_error_codes": const LibraryInfo(
+      "_internal/compiler/js_lib/shared/async_await_error_codes.dart",
+      category: "Internal",
+      documented: false,
+      platforms: DART2JS_PLATFORM),
+
   "_metadata": const LibraryInfo(
       "html/html_common/metadata.dart",
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
 };
 
 /**
  * Information about a "dart:" library.
  */
@@ skipping 96 matching lines @@
   static const Maturity STABLE = const Maturity(4, "Stable",
     "The library is stable. API backwards-compatibility is guaranteed.\n"
     "However implementation details might change.");
 
   static const Maturity LOCKED = const Maturity(5, "Locked",
     "This library will not change except when serious bugs are encountered.");
 
   static const Maturity UNSPECIFIED = const Maturity(-1, "Unspecified",
     "The maturity for this library has not been specified.");
 }