feat(core): introduce support for animations

Closes #8734

modules/@angular/platform-server/src/abstract_html_adapter.dart

@@ -7,6 +7,7 @@ import 'package:angular2/platform/common_dom.dart';
 import 'package:angular2/src/compiler/xhr.dart';
 
 import 'package:angular2/src/facade/lang.dart' show isBlank, isPresent;
+import 'package:angular2/src/platform/dom/animation/dom_animate_player.dart' show DomAnimatePlayer;
 
 const _attrToPropMap = const {
   'innerHtml': 'innerHTML',
@@ -385,6 +386,10 @@ abstract class AbstractHtml5LibAdapter implements DomAdapter {
     return false;
   }
 
+  bool supportsWebAnimation() {
+    return false;
+  }
+
   getHistory() {
     throw 'not implemented';
   }
@@ -445,4 +450,8 @@ abstract class AbstractHtml5LibAdapter implements DomAdapter {
   supportsAnimation() {
     throw 'not implemented';
   }
+
+  DomAnimatePlayer animate(element, keyframes, options) {
+    throw 'not implemented';
+  }
 }

modules/@angular/platform-server/src/parse5_adapter.ts

@@ -553,6 +553,7 @@ export class Parse5DomAdapter extends DomAdapter {
   setGlobalVar(path: string, value: any) { setValueOnPath(global, path, value); }
   requestAnimationFrame(callback): number { return setTimeout(callback, 0); }
   cancelAnimationFrame(id: number) { clearTimeout(id); }
+  supportsWebAnimation(): boolean { return true; }
   performanceNow(): number { return DateWrapper.toMillis(DateWrapper.now()); }
   getAnimationPrefix(): string { return ''; }
   getTransitionEnd(): string { return 'transitionend'; }