feat(perf): change detection profiler

Closes #4000

modules/angular2/test/tools/spies.dart

@@ -0,0 +1,27 @@
+import 'package:angular2/test_lib.dart' show SpyObject;
+import 'package:angular2/core.dart'
+    show ApplicationRef, LifeCycle, Injector, bind;
+import 'dart:js';
+
+@proxy
+class SpyLifeCycle extends SpyObject implements LifeCycle {
+  noSuchMethod(m) => super.noSuchMethod(m);
+}
+
+@proxy
+class SpyApplicationRef extends SpyObject implements ApplicationRef {
+  Injector injector;
+
+  SpyApplicationRef() {
+    this.injector = Injector.resolveAndCreate([
+      bind(LifeCycle).toClass(SpyLifeCycle)
+    ]);
+  }
+
+  noSuchMethod(m) => super.noSuchMethod(m);
+}
+
+void callNgProfilerTimeChangeDetection([config]) {
+  context['ng']['profiler'].callMethod('timeChangeDetection',
+      config != null ? [config] : []);
+}

modules/angular2/test/tools/spies.ts

@@ -0,0 +1,15 @@
+import {SpyObject} from 'angular2/test_lib';
+import {ApplicationRef, LifeCycle, Injector, bind} from 'angular2/angular2';
+import {global} from 'angular2/src/core/facade/lang';
+
+export class SpyApplicationRef extends SpyObject {
+  injector;
+  constructor() {
+    super();
+    this.injector = Injector.resolveAndCreate([bind(LifeCycle).toValue({tick: () => {}})]);
+  }
+}
+
+export function callNgProfilerTimeChangeDetection(config?): void {
+  (<any>global).ng.profiler.timeChangeDetection(config);
+}

modules/angular2/test/tools/tools_spec.ts

@@ -0,0 +1,27 @@
+import {
+  afterEach,
+  beforeEach,
+  ddescribe,
+  describe,
+  expect,
+  iit,
+  inject,
+  it,
+  xit
+} from 'angular2/test_lib';
+
+import {enableDebugTools, disableDebugTools} from 'angular2/tools';
+import {SpyApplicationRef, callNgProfilerTimeChangeDetection} from './spies';
+
+export function main() {
+  describe('profiler', () => {
+    beforeEach(() => { enableDebugTools((<any>new SpyApplicationRef())); });
+
+    afterEach(() => { disableDebugTools(); });
+
+    it('should time change detection', () => { callNgProfilerTimeChangeDetection(); });
+
+    it('should time change detection with recording',
+       () => { callNgProfilerTimeChangeDetection({'record': true}); });
+  });
+}