refactor(platform-browser): move platform-browser/animations to animations/browser (#15130)

Closes: #15130

packages/animations/browser/src/render/web_animations/dom_animation.ts

@@ -0,0 +1,19 @@
+/**
+ * @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
+ */
+
+export interface DOMAnimation {
+  cancel(): void;
+  play(): void;
+  pause(): void;
+  finish(): void;
+  onfinish: Function;
+  position: number;
+  currentTime: number;
+  addEventListener(eventName: string, handler: (event: any) => any): any;
+  dispatchEvent(eventName: string): any;
+}