reland -- Disable animations during aura tests.

ash/drag_drop/drag_drop_animation_observer_client.h

+// 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.
+
+#ifndef ASH_DRAG_DROP_DRAG_DROP_ANIMATION_OBSERVER_CLIENT_H_
+#define ASH_DRAG_DROP_DRAG_DROP_ANIMATION_OBSERVER_CLIENT_H_
+#pragma once
+
+#include "ash/ash_export.h"
+
+namespace ui {
+class ImplicitAnimationObserver;
+}  // namespace ui
+
+namespace ash {
+namespace internal {
+
+class ASH_EXPORT DragDropAnimationObserverClient {

[sky, 2012/01/27 17:54:10]

I think I sent you on the wrong path here. There's no point in exposing this.
Instead make DragDropAnimationObserver take a DragDropController* and invoke
whatever method you need from there. If you want to make the method
DragDropController invokes private, forward declare DragDropAnimationObserver in
DragDropController's private section.

+ public:
+  virtual void OnDragDropAnimationsCompleted(
+      ui::ImplicitAnimationObserver* observer) = 0;
+
+ protected:
+  virtual ~DragDropAnimationObserverClient() {}
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_DRAG_DROP_DRAG_DROP_ANIMATION_OBSERVER_CLIENT_H_
+