Patches to support Dart VM patch files in dart2js.

runtime/lib/convert_patch.dart

Index: runtime/lib/convert_patch.dart
diff --git a/runtime/lib/convert_patch.dart b/runtime/lib/convert_patch.dart
index 3c50f2ac27b3e5333a8e0ae553606db16e2abaed..c5123bdddf4e7b911849e9bc4848ebf7f5f8f591 100644
--- a/runtime/lib/convert_patch.dart
+++ b/runtime/lib/convert_patch.dart
@@ -6,7 +6,7 @@ import "dart:_internal" show POWERS_OF_TEN;
 
 // JSON conversion.
 
-patch _parseJson(String json, reviver(var key, var value)) {
+patch _parseJson(String source, reviver(key, value)) {
   _BuildJsonListener listener;
   if (reviver == null) {
     listener = new _BuildJsonListener();
@@ -14,8 +14,8 @@ patch _parseJson(String json, reviver(var key, var value)) {
     listener = new _ReviverJsonListener(reviver);
   }
   var parser = new _JsonStringParser(listener);
-  parser.chunk = json;
-  parser.chunkEnd = json.length;
+  parser.chunk = source;
+  parser.chunkEnd = source.length;
   parser.parse(0);
   parser.close();
   return listener.result;