Notify WebMediaPlayer when its ancestor enters/exists fullscreen.

third_party/WebKit/public/platform/WebMediaPlayer.h

Index: third_party/WebKit/public/platform/WebMediaPlayer.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayer.h b/third_party/WebKit/public/platform/WebMediaPlayer.h
index 87c058c8da7cf3760c0fa3293db6c6c03b65dd3d..3feafceb572e0d191d0301fc2d8d677fd1dac36d 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayer.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayer.h
@@ -227,6 +227,12 @@ class WebMediaPlayer {
   virtual void enteredFullscreen() {}
   virtual void exitedFullscreen() {}
 
+  // Inform WebMediaPlayer when its ancestor enters full screen and the element
+  // covers most of the window.
+  virtual void enteredFullWindow() {}
+  // Inform WebMediaPlayer when its ancestor exits full screen.
+  virtual void exitedFullWindow() {}
+
   virtual void enabledAudioTracksChanged(
       const WebVector<TrackId>& enabledTrackIds) {}
   // |selectedTrackId| is null if no track is selected.