Devtools Animations: Update timeline controls and UI

Source/devtools/front_end/elements/AnimationControlPane.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.StylesSidebarPane.BaseToolbarPaneWidget}
  */
 WebInspector.AnimationControlPane = function(toolbarItem)
 {
@@ skipping 117 matching lines @@
     },
 
     _clicked: function()
     {
         if (Runtime.experiments.isEnabled("animationInspection"))
             this._animationTimelineModeClick();
         else
             this._animationControlPaneModeClick();
     },
 
-    _nodeChanged: function()
+    /**
+     * @param {!Event=} event
+     */
+    _nodeChanged: function(event)
     {
         this._button.setEnabled(!!WebInspector.context.flavor(WebInspector.DOMNode));
+        if (event && this._animationTimeline)

[pfeldman, 2015/06/05 14:34:34]

When is event undefined?

[samli, 2015/06/09 03:53:08]

Called in WebInspector.AnimationControlPane.ButtonProvider().

+            this._animationTimeline.setNode(/** @type {!WebInspector.DOMNode} */(event.data));
     },
 
     /**
      * @override
      * @return {!WebInspector.ToolbarItem}
      */
     item: function()
     {
         return this._button;
     }
 }