Update Ash network icon code and integrate with tray

ash/system/chromeos/network/network_icon_animation.cc

 // 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.
 
 #include "ash/system/chromeos/network/network_icon_animation.h"
 
 #include "ash/system/chromeos/network/network_icon_animation_observer.h"
 
 namespace {
 const int kThrobDurationMs = 750;  // Animation cycle length.
@@ skipping 30 matching lines @@
 void NetworkIconAnimation::AddObserver(AnimationObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void NetworkIconAnimation::RemoveObserver(AnimationObserver* observer) {
   observers_.RemoveObserver(observer);
   if (observers_.size() == 0)
     animation_.Stop();
 }
 
+void NetworkIconAnimation::AddNetwork(const std::string& network_id) {
+  networks_.insert(network_id);
+  // Animation will start (if stopped) when GetAnimation is called.
+}
+
+void NetworkIconAnimation::RemoveNetwork(const std::string& network_id) {
+  networks_.erase(network_id);
+  if (networks_.empty())
+    animation_.Reset();
+}
+
 // static
 NetworkIconAnimation* NetworkIconAnimation::GetInstance() {
   static NetworkIconAnimation* s_icon_animation =
       new NetworkIconAnimation();
   return s_icon_animation;
 }
 
 }  // namespace network_icon
 }  // namespace ash