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

ash/common/system/chromeos/screen_security/screen_capture_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_CAPTURE_TRAY_ITEM_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_CAPTURE_TRAY_ITEM_H_
 
 #include "ash/common/shell_observer.h"
 #include "ash/common/system/chromeos/screen_security/screen_capture_observer.h"
 #include "ash/common/system/chromeos/screen_security/screen_tray_item.h"
@@ skipping 13 matching lines @@
   ~ScreenCaptureTrayItem() 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 ScreenCaptureObserver.
   void OnScreenCaptureStart(
       const base::Closure& stop_callback,
       const base::string16& screen_capture_status) override;
   void OnScreenCaptureStop() override;
 
   // Overridden from ShellObserver.
   void OnCastingSessionStartedOrStopped(bool started) override;
 
   base::string16 screen_capture_status_;
   bool is_casting_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenCaptureTrayItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_CAPTURE_TRAY_ITEM_H_