ash: Add metrics for screen lock and shutdown.

ash/wm/session_state_controller_impl2.cc

Index: ash/wm/session_state_controller_impl2.cc
diff --git a/ash/wm/session_state_controller_impl2.cc b/ash/wm/session_state_controller_impl2.cc
index 2084e00c5096c08c344581fdd07e3f5b434e413d..bb5c68eaa789d0fd7cc7b128e6ac7d3b5ff1694a 100644
--- a/ash/wm/session_state_controller_impl2.cc
+++ b/ash/wm/session_state_controller_impl2.cc
@@ -370,6 +370,8 @@ void SessionStateControllerImpl2::OnRealShutdownTimeout() {
     }
   }
 #endif
+  Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+      UMA_ACCEL_SHUT_DOWN_POWER_BUTTON);
   delegate_->RequestShutdown();
 }
 
@@ -386,8 +388,13 @@ void SessionStateControllerImpl2::LockAnimationCancelled() {
 void SessionStateControllerImpl2::PreLockAnimationFinished(bool request_lock) {
   can_cancel_lock_animation_ = false;
 
-  if (request_lock)
+  if (request_lock) {
+    Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+        shutdown_after_lock_ ?
+        UMA_ACCEL_LOCK_SCREEN_POWER_BUTTON :
+        UMA_ACCEL_LOCK_SCREEN_LOCK_BUTTON);
     delegate_->RequestLockScreen();
+  }
 
   lock_fail_timer_.Start(
       FROM_HERE,