feat(benchpress): rewritten implementation

Limitations:
- cloud reporter is not yet supported any more

modules/angular2/src/facade/collection.dart

@@ -98,8 +98,7 @@ class ListWrapper {
     l.add(e);
   }
   static List concat(List a, List b) {
-    a.addAll(b);
-    return a;
+    return []..addAll(a)..addAll(b);
   }
   static bool isList(l) => l is List;
   static void insert(List l, int index, value) {

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);
+}

modules/angular2/src/facade/lang.es6

@@ -247,3 +247,6 @@ export function print(obj) {
     console.log(obj);
   }
 }
+
+// Can't be all uppercase as our transpiler would think it is a special directive...
+export var Json = _global.JSON;

modules/angular2/src/facade/math.dart

@@ -1,7 +1,10 @@
 library angular.core.facade.math;
 
+import 'dart:core' show double, num;
 import 'dart:math' as math;
 
+var NaN = double.NAN;
+
 class Math {
   static num pow(num x, num exponent) {
     return math.pow(x, exponent);
@@ -10,4 +13,8 @@ class Math {
   static num min(num a, num b) => math.min(a, b);
 
   static num floor(num a) => a.floor();
+
+  static num ceil(num a) => a.ceil();
+
+  static num sqrt(num x) => math.sqrt(x);
 }

modules/angular2/src/facade/math.es6

@@ -1,3 +1,4 @@
 import {global} from 'angular2/src/facade/lang';
 
-export var Math = global.Math;
+export var Math = global.Math;
+export var NaN = global.NaN;