ash: Animate changes in the uber tray.

ash/system/audio/tray_volume.cc

 // Copyright (c) 2012 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.
 
 #include "ash/system/audio/tray_volume.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_views.h"
@@ skipping 174 matching lines @@
   if (is_default_view_)
     volume_view_.reset();
 }
 
 void TrayVolume::DestroyDetailedView() {
   if (!is_default_view_)
     volume_view_.reset();
 }
 
 void TrayVolume::OnVolumeChanged(float percent) {
-  if (image_view())
-    image_view()->SetVisible(GetInitialVisibility());
+  if (tray_view())
+    tray_view()->SetVisible(GetInitialVisibility());
 
   if (volume_view_.get()) {
     volume_view_->SetVolumeLevel(percent);
     SetDetailedViewCloseDelay(kTrayPopupAutoCloseDelayInSeconds);
     return;
   }
   PopupDetailedView(kTrayPopupAutoCloseDelayInSeconds, false);
 }
 
 }  // namespace internal
 }  // namespace ash