Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/chromeos/network/tray_sms.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_sms.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/metrics/user_metrics_action.h"
 #include "ash/common/system/tray/fixed_sized_scroll_view.h"
 #include "ash/common/system/tray/system_tray.h"
@@ skipping 276 matching lines @@
 
  private:
   TraySms* tray_sms() { return static_cast<TraySms*>(owner()); }
 
   size_t message_index_;
 
   DISALLOW_COPY_AND_ASSIGN(SmsNotificationView);
 };
 
 TraySms::TraySms(SystemTray* system_tray)
-    : SystemTrayItem(system_tray),
+    : SystemTrayItem(system_tray, UMA_SMS),
       default_(nullptr),
       detailed_(nullptr),
       notification_(nullptr) {
   // TODO(armansito): SMS could be a special case for cellular that requires a
   // user (perhaps the owner) to be logged in. If that is the case, then an
   // additional check should be done before subscribing for SMS notifications.
   if (chromeos::NetworkHandler::IsInitialized())
     chromeos::NetworkHandler::Get()->network_sms_handler()->AddObserver(this);
 }
 
@@ skipping 117 matching lines @@
       std::string number, text;
       if (GetLatestMessage(&index, &number, &text))
         notification_->Update(index, number, text);
     } else if (notify) {
       ShowNotificationView();
     }
   }
 }
 
 }  // namespace ash