Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/chromeos/screen_security/screen_tray_item.h

 // Copyright 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_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_TRAY_ITEM_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_TRAY_ITEM_H_
 
 #include <string>
 
 #include "ash/common/system/tray/system_tray.h"
@@ skipping 73 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ScreenNotificationDelegate);
 };
 
 }  // namespace tray
 
 // The base tray item for screen capture and screen sharing. The
 // Start method brings up a notification and a tray item, and the user
 // can stop the screen capture/sharing by pressing the stop button.
 class ASH_EXPORT ScreenTrayItem : public SystemTrayItem {
  public:
-  explicit ScreenTrayItem(SystemTray* system_tray);
+  ScreenTrayItem(SystemTray* system_tray, UmaType uma_type);
   ~ScreenTrayItem() override;
 
   tray::ScreenTrayView* tray_view() { return tray_view_; }
   void set_tray_view(tray::ScreenTrayView* tray_view) {
     tray_view_ = tray_view;
   }
 
   tray::ScreenStatusView* default_view() { return default_view_; }
   void set_default_view(tray::ScreenStatusView* default_view) {
     default_view_ = default_view;
@@ skipping 30 matching lines @@
   tray::ScreenStatusView* default_view_;
   bool is_started_;
   base::Closure stop_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenTrayItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_TRAY_ITEM_H_