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

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

Index: ash/common/system/chromeos/screen_security/screen_capture_tray_item.cc
diff --git a/ash/common/system/chromeos/screen_security/screen_capture_tray_item.cc b/ash/common/system/chromeos/screen_security/screen_capture_tray_item.cc
index a77114ac2d7793187c6c1cfd199567c1a4d03af1..a6ab6ab2eadb4e57e6836b92da144c63183bf2d3 100644
--- a/ash/common/system/chromeos/screen_security/screen_capture_tray_item.cc
+++ b/ash/common/system/chromeos/screen_security/screen_capture_tray_item.cc
@@ -6,6 +6,7 @@
 
 #include <utility>
 
+#include "ash/common/metrics/user_metrics_action.h"
 #include "ash/common/system/system_notifier.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
@@ -70,6 +71,16 @@ std::string ScreenCaptureTrayItem::GetNotificationId() {
   return kScreenCaptureNotificationId;
 }
 
+void ScreenCaptureTrayItem::RecordStoppedFromDefaultViewMetric() {
+  WmShell::Get()->RecordUserMetricsAction(
+      UMA_STATUS_AREA_SCREEN_CAPTURE_DEFAULT_STOP);
+}
+
+void ScreenCaptureTrayItem::RecordStoppedFromNotificationViewMetric() {
+  WmShell::Get()->RecordUserMetricsAction(
+      UMA_STATUS_AREA_SCREEN_CAPTURE_NOTIFICATION_STOP);
+}
+
 void ScreenCaptureTrayItem::OnScreenCaptureStart(
     const base::Closure& stop_callback,
     const base::string16& screen_capture_status) {