Move tray code from ui/chromeos/network/

ui/chromeos/network/network_icon_animation_observer.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 UI_CHROMEOS_NETWORK_NETWORK_ICON_ANIMATION_OBSERVER_H_
-#define UI_CHROMEOS_NETWORK_NETWORK_ICON_ANIMATION_OBSERVER_H_
-
-#include "ui/chromeos/ui_chromeos_export.h"
-
-namespace ui {
-namespace network_icon {
-
-// Observer interface class for animating network icons.
-class UI_CHROMEOS_EXPORT AnimationObserver {
- public:
-  // Called when the image has changed due to animation. The callback should
-  // trigger a call to GetImageForNetwork() to retrieve the image.
-  virtual void NetworkIconChanged() = 0;
-
- protected:
-  virtual ~AnimationObserver() {}
-};
-
-}  // namespace network_icon
-}  // namespace ui
-
-#endif  // UI_CHROMEOS_NETWORK_NETWORK_ICON_ANIMATION_OBSERVER_H_