Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/chromeos/network/tray_network.cc

 // 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.
 
 #include "ash/common/system/chromeos/network/tray_network.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/chromeos/network/network_state_list_detailed_view.h"
 #include "ash/common/system/chromeos/network/tray_network_state_observer.h"
@@ skipping 217 matching lines @@
  private:
   views::ImageView* image_view_;
   views::Label* label_view_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkWifiDetailedView);
 };
 
 }  // namespace tray
 
 TrayNetwork::TrayNetwork(SystemTray* system_tray)
-    : SystemTrayItem(system_tray),
+    : SystemTrayItem(system_tray, UMA_NETWORK),
       tray_(NULL),
       default_(NULL),
       detailed_(NULL),
       request_wifi_view_(false) {
   network_state_observer_.reset(new TrayNetworkStateObserver(this));
   SystemTrayNotifier* notifier = WmShell::Get()->system_tray_notifier();
   notifier->AddNetworkObserver(this);
   notifier->AddNetworkPortalDetectorObserver(this);
 }
 
@@ skipping 81 matching lines @@
 void TrayNetwork::NetworkStateChanged() {
   if (tray_)
     tray_->UpdateNetworkStateHandlerIcon();
   if (default_)
     default_->Update();
   if (detailed_)
     detailed_->Update();
 }
 
 }  // namespace ash