refactor(animations): move MockAnimationPlayer back into core (#9966)

Closes #9966

modules/@angular/core/testing/mock_animation_player.ts

@@ -0,0 +1,64 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {AnimationPlayer} from '../src/animation/animation_player';
+import {isPresent} from '../src/facade/lang';
+
+export class MockAnimationPlayer implements AnimationPlayer {
+  private _subscriptions: any[] /** TODO #9100 */ = [];
+  private _finished = false;
+  private _destroyed = false;
+  private _started: boolean = false;
+
+  public parentPlayer: AnimationPlayer = null;
+
+  public log: any[] /** TODO #9100 */ = [];
+
+  private _onfinish(): void {
+    if (!this._finished) {
+      this._finished = true;
+      this.log.push('finish');
+
+      this._subscriptions.forEach((entry) => { entry(); });
+      this._subscriptions = [];
+      if (!isPresent(this.parentPlayer)) {
+        this.destroy();
+      }
+    }
+  }
+
+  init(): void { this.log.push('init'); }
+
+  onDone(fn: Function): void { this._subscriptions.push(fn); }
+
+  hasStarted() { return this._started; }
+
+  play(): void {
+    this._started = true;
+    this.log.push('play');
+  }
+
+  pause(): void { this.log.push('pause'); }
+
+  restart(): void { this.log.push('restart'); }
+
+  finish(): void { this._onfinish(); }
+
+  reset(): void { this.log.push('reset'); }
+
+  destroy(): void {
+    if (!this._destroyed) {
+      this._destroyed = true;
+      this.finish();
+      this.log.push('destroy');
+    }
+  }
+
+  setPosition(p: any /** TODO #9100 */): void {}
+  getPosition(): number { return 0; }
+}

modules/@angular/core/testing/testing_internal.ts

@@ -13,10 +13,11 @@ import {Math, global, isFunction, isPromise} from '../src/facade/lang';
 import {AsyncTestCompleter} from './async_test_completer';
 import {getTestInjector, inject} from './test_injector';
 
-export {MockAnimationPlayer} from '@angular/platform-browser/testing/mock_animation_player';
 export {AsyncTestCompleter} from './async_test_completer';
+export {MockAnimationPlayer} from './mock_animation_player';
 export {inject} from './test_injector';
 export {expect} from './testing';
+
 export * from './logger';
 export * from './ng_zone_mock';
 export * from './mock_application_ref';