feat(benchpress): rewritten implementation

Limitations:
- cloud reporter is not yet supported any more

modules/angular2/src/facade/lang.dart

@@ -2,6 +2,7 @@ library angular.core.facade.lang;
 
 export 'dart:core' show Type, RegExp, print;
 import 'dart:math' as math;
+import 'dart:convert' as convert;
 
 class Math {
   static final _random = new math.Random();
@@ -176,3 +177,9 @@ bool assertionsEnabled() {
     return true;
   }
 }
+
+// Can't be all uppercase as our transpiler would think it is a special directive...
+class Json {
+  static parse(String s) => convert.JSON.decode(s);
+  static stringify(data) => convert.JSON.encode(data);
+}