Use internal hooks for notifying fullscreen changes to media controls

third_party/WebKit/Source/core/html/shadow/MediaControlsOrientationLockDelegate.h

Index: third_party/WebKit/Source/core/html/shadow/MediaControlsOrientationLockDelegate.h
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlsOrientationLockDelegate.h b/third_party/WebKit/Source/core/html/shadow/MediaControlsOrientationLockDelegate.h
index cb87959540ba36fdba6d3cbd9eddca2db0a903d6..34f35e58a3e853964cac0081a2f5d7e6409e9130 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlsOrientationLockDelegate.h
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlsOrientationLockDelegate.h
@@ -29,22 +29,20 @@ class HTMLVideoElement;
 //   lock was applied.
 //
 // The possible state transitions are:
-// - PendingFullscreen => PendingMetadata: on fullscreenchange event (entering
-//   fullscreen) when metadata are not available;
-// - PendingFullscreen => MaybeLockedFullscreen: on fullscreenchange event
-//   (entering fullscreen) when metadata are available;
+// - PendingFullscreen => PendingMetadata: on entering fullscreen when metadata
+//   are not available;
+// - PendingFullscreen => MaybeLockedFullscreen: on entering fullscreen when
+//   metadata are available;
 // - PendingMetadata => MaybeLockedFullscreen: on loadedmetadata;
-// - PendingMetadata => PendingFullscreen: on fullscreenchange event (leaving
-//   fullscreen);
-// - MaybeLockedFullscreen => PendingFullscreen: on fullscreenchange event
-//   (leaving fullscreen).
+// - PendingMetadata => PendingFullscreen: on exiting fullscreen;
+// - MaybeLockedFullscreen => PendingFullscreen: on exiting fullscreen.
 class CORE_EXPORT MediaControlsOrientationLockDelegate final
     : public EventListener {
  public:
   explicit MediaControlsOrientationLockDelegate(HTMLVideoElement&);
 
-  // Called by MediaControls when the HTMLMediaElement is added to a document
-  // document. All event listeners should be added.
+  // Called by MediaControls when the HTMLMediaElement is added to a document.
+  // All event listeners should be added.
   void attach();
 
   // Called by MediaControls when the HTMLMediaElement is no longer in the
@@ -52,6 +50,10 @@ class CORE_EXPORT MediaControlsOrientationLockDelegate final
   // object to be garbage collected.
   void detach();
 
+  // Called by MediaControls when the fullscreen element changes.
+  void didEnterFullscreen();
+  void didExitFullscreen();
+
   // EventListener implementation.
   bool operator==(const EventListener&) const override;