feat(perf): change detection profiler

Closes #4000

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}); });
+  });
+}