reland -- Disable animations during aura tests.

ash/wm/shelf_animation_observer_client.h

Index: ash/wm/shelf_animation_observer_client.h
diff --git a/ash/wm/shelf_animation_observer_client.h b/ash/wm/shelf_animation_observer_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..584019adbb51993598ab0838947093e4f58ebd40
--- /dev/null
+++ b/ash/wm/shelf_animation_observer_client.h
@@ -0,0 +1,31 @@
+// 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_WM_SHELF_ANIMATION_OBSERVER_CLIENT_H_
+#define ASH_WM_SHELF_ANIMATION_OBSERVER_CLIENT_H_
+#pragma once
+
+#include "ash/ash_export.h"
+
+namespace ui {
+class ImplicitAnimationObserver;
+}  // namespace ui
+
+namespace ash {
+namespace internal {
+
+class ASH_EXPORT ShelfAnimationObserverClient {
+ public:
+  virtual void OnShelfAnimationsCompleted(
+      ui::ImplicitAnimationObserver* observer) = 0;
+
+ protected:
+  virtual ~ShelfAnimationObserverClient() {}
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_SHELF_ANIMATION_OBSERVER_CLIENT_H_
+