Add parseJson to DartUtilities.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 6f1430344e6dff9390313655005de9f4749b478f..9e93013ff16461e2217a7ad7c4821fbc951a48ad 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -37531,6 +37531,8 @@ class _Utils {
 
   static Map createMap() => {};
 
+  static parseJson(String jsonSource) => const JsonDecoder().convert(jsonSource);

[blois, 2014/08/02 00:16:30]

Should this be modified in html_native_DOMImplementation.dart?

[vsm, 2014/08/04 14:34:42]

Yes, html_dartium.dart is generated via script.

This change should probably go into
tools/dom/src/html_native_DOMImplementation.dart.  Edit there and run
tools/dom/scripts/go.sh.  That should include your change in this file.

If you have changes to dart2js code (you shouldn't for this), it should also get
tested in a regular enlistment. 

+
   static makeUnimplementedError(String fileName, int lineNo) {
     return new UnsupportedError('[info: $fileName:$lineNo]');
   }