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

ash/common/system/chromeos/screen_security/screen_share_tray_item.cc

 // 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.
 
 #include "ash/common/system/chromeos/screen_security/screen_share_tray_item.h"
 
 #include <utility>
 
 #include "ash/common/system/system_notifier.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
@@ skipping 59 matching lines @@
       data, new tray::ScreenNotificationDelegate(this)));
   notification->SetSystemPriority();
   message_center::MessageCenter::Get()->AddNotification(
       std::move(notification));
 }
 
 std::string ScreenShareTrayItem::GetNotificationId() {
   return kScreenShareNotificationId;
 }
 
+void ScreenShareTrayItem::RecordStoppedFromDefaultViewMetric() {
+  // Intentionally not recording a metric.
+}
+
+void ScreenShareTrayItem::RecordStoppedFromNotificationViewMetric() {
+  // Intentionally not recording a metric.
+}
+
 void ScreenShareTrayItem::OnScreenShareStart(
     const base::Closure& stop_callback,
     const base::string16& helper_name) {
   helper_name_ = helper_name;
   Start(stop_callback);
 }
 
 void ScreenShareTrayItem::OnScreenShareStop() {
   // We do not need to run the stop callback
   // when screening is stopped externally.
   set_is_started(false);
   Update();
 }
 
 }  // namespace ash