chromeos: Notify power manager about user activity.

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index ef4cb34496016d81e5c8a5ed3cf9d0cf3754bae5..3336291b68ae6898982ef5917da3aeebb3cce837 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -69,6 +69,7 @@ class ShellDelegate;
 class ShellObserver;
 class SystemTrayDelegate;
 class SystemTray;
+class UserActivityDetector;
 class UserWallpaperDelegate;
 class VideoDetector;
 class WindowCycleController;
@@ -247,6 +248,9 @@ class ASH_EXPORT Shell {
   PowerButtonController* power_button_controller() {
     return power_button_controller_.get();
   }
+  UserActivityDetector* user_activity_detector() {
+    return user_activity_detector_.get();
+  }
   VideoDetector* video_detector() {
     return video_detector_.get();
   }
@@ -390,6 +394,7 @@ class ASH_EXPORT Shell {
   scoped_ptr<internal::VisibilityController> visibility_controller_;
   scoped_ptr<DesktopBackgroundController> desktop_background_controller_;
   scoped_ptr<PowerButtonController> power_button_controller_;
+  scoped_ptr<UserActivityDetector> user_activity_detector_;
   scoped_ptr<VideoDetector> video_detector_;
   scoped_ptr<WindowCycleController> window_cycle_controller_;
   scoped_ptr<internal::FocusCycler> focus_cycler_;