Patches to support Dart VM patch files in dart2js.

runtime/lib/double_patch.dart

Index: runtime/lib/double_patch.dart
diff --git a/runtime/lib/double_patch.dart b/runtime/lib/double_patch.dart
index f33122ac763da4de7ff8611918fa8aa8d5c5a204..5a0c98fe5a9037e284fbc469f09ff47301a3acca 100644
--- a/runtime/lib/double_patch.dart
+++ b/runtime/lib/double_patch.dart
@@ -101,12 +101,12 @@ patch class double {
     return _nativeParse(str, start, end);
   }
 
-  /* patch */ static double parse(String str,
-                                  [double onError(String str)]) {
-    var result = _parse(str);
+  /* patch */ static double parse(String source,
+                                  [double onError(String source)]) {
+    var result = _parse(source);
     if (result == null) {
-      if (onError == null) throw new FormatException("Invalid double", str);
-      return onError(str);
+      if (onError == null) throw new FormatException("Invalid double", source);
+      return onError(source);
     }
     return result;
   }