Added UMA metrics for screen capture UI in the status area.

ash/common/system/chromeos/screen_security/screen_share_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_SHARE_TRAY_ITEM_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_TRAY_ITEM_H_
 
 #include "ash/common/system/chromeos/screen_security/screen_share_observer.h"
 #include "ash/common/system/chromeos/screen_security/screen_tray_item.h"
 #include "base/macros.h"
@@ skipping 11 matching lines @@
   ~ScreenShareTrayItem() override;
 
  private:
   // Overridden from SystemTrayItem.
   views::View* CreateTrayView(LoginStatus status) override;
   views::View* CreateDefaultView(LoginStatus status) override;
 
   // Overridden from ScreenTrayItem.
   void CreateOrUpdateNotification() override;
   std::string GetNotificationId() override;
+  void RecordStoppedFromDefaultViewMetric() override;
+  void RecordStoppedFromNotificationViewMetric() override;
 
   // Overridden from ScreenShareObserver.
   void OnScreenShareStart(const base::Closure& stop_callback,
                           const base::string16& helper_name) override;
   void OnScreenShareStop() override;
 
   base::string16 helper_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenShareTrayItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_TRAY_ITEM_H_