Add is_fullscreen to video updates

ash/wm/video_detector.h

Index: ash/wm/video_detector.h
diff --git a/ash/wm/video_detector.h b/ash/wm/video_detector.h
index 5dda5f6edf3a354d1fbc5c43e61e655a424fa939..7b7de795a82fce1c625c9714e3bb8fd084ab53af 100644
--- a/ash/wm/video_detector.h
+++ b/ash/wm/video_detector.h
@@ -30,7 +30,7 @@ namespace ash {
 class ASH_EXPORT VideoDetectorObserver {
  public:
   // Invoked periodically while a video is being played onscreen.
-  virtual void OnVideoDetected() = 0;
+  virtual void OnVideoDetected(bool is_fullscreen) = 0;
 
  protected:
   virtual ~VideoDetectorObserver() {}