Update Ash network icon code and integrate with tray

ash/system/chromeos/network/network_icon_animation.h

 // Copyright (c) 2013 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_SYSTEM_CHROMEOS_NETWORK_NETWORK_ICON_ANIMATION_H_
 #define ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_ICON_ANIMATION_H_
 
+#include <set>
+#include <string>
+
 #include "ash/ash_export.h"
 #include "base/observer_list.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/throb_animation.h"
 
 namespace ash {
 namespace network_icon {
 
 class AnimationObserver;
 
 // Single instance class to handle icon animations and keep them in sync.
 class ASH_EXPORT NetworkIconAnimation : public ui::AnimationDelegate {
  public:
   NetworkIconAnimation();
   virtual ~NetworkIconAnimation();
 
   // Returns the current animation value, [0-1].
   double GetAnimation();
 
   void AddObserver(AnimationObserver* observer);
   void RemoveObserver(AnimationObserver* observer);
+  void AddNetwork(const std::string& network_id);
+  void RemoveNetwork(const std::string& network_id);
 
   // ui::AnimationDelegate implementation.
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   static NetworkIconAnimation* GetInstance();
 
  private:
   ui::ThrobAnimation animation_;
   ObserverList<AnimationObserver> observers_;
+  std::set<std::string> networks_;
 };
 
 }  // namespace network_icon
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_NETWORK_NETWORK_ICON_ANIMATION_H_