feat(animations): expose the element value within transition events

modules/@angular/core/src/animation/animation_transition.ts

@@ -5,20 +5,23 @@
  * 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 {ElementRef} from '../linker/element_ref';
+
 import {AnimationPlayer} from './animation_player';
 import {AnimationTransitionEvent} from './animation_transition_event';
 
 export class AnimationTransition {
   constructor(
-      private _player: AnimationPlayer, private _fromState: string, private _toState: string,
-      private _totalTime: number) {}
+      private _player: AnimationPlayer, private _element: ElementRef, private _fromState: string,
+      private _toState: string, private _totalTime: number) {}
 
   private _createEvent(phaseName: string): AnimationTransitionEvent {
     return new AnimationTransitionEvent({
       fromState: this._fromState,
       toState: this._toState,
       totalTime: this._totalTime,
-      phaseName: phaseName
+      phaseName: phaseName,
+      element: this._element
     });
   }
 

modules/@angular/core/src/animation/animation_transition_event.ts

@@ -5,6 +5,7 @@
  * 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 {ElementRef} from '../linker/element_ref';
 
 /**
  * An instance of this class is returned as an event parameter when an animation
@@ -42,12 +43,19 @@ export class AnimationTransitionEvent {
   public toState: string;
   public totalTime: number;
   public phaseName: string;
+  public element: ElementRef;
 
-  constructor({fromState, toState, totalTime, phaseName}:
-                  {fromState: string, toState: string, totalTime: number, phaseName: string}) {
+  constructor({fromState, toState, totalTime, phaseName, element}: {
+    fromState: string,
+    toState: string,
+    totalTime: number,
+    phaseName: string,
+    element: any
+  }) {
     this.fromState = fromState;
     this.toState = toState;
     this.totalTime = totalTime;
     this.phaseName = phaseName;
+    this.element = new ElementRef(element);
   }
 }