Use internal hooks for notifying fullscreen changes to media controls

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 920ab117c5f36287cde9d779bafc3f069e51be63..5748124b77e67bd9dee314115827c66747812836 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -3519,6 +3519,8 @@ void HTMLMediaElement::didEnterFullscreen() {
   // FIXME: There is no embedder-side handling in layout test mode.
   if (webMediaPlayer() && !LayoutTestSupport::isRunningLayoutTest())
     webMediaPlayer()->enteredFullscreen();
+  if (mediaControls())
+    mediaControls()->didEnterFullscreen();
   // Cache this in case the player is destroyed before leaving fullscreen.
   m_inOverlayFullscreenVideo = usesOverlayFullscreenVideo();
   if (m_inOverlayFullscreenVideo)
@@ -3531,6 +3533,8 @@ void HTMLMediaElement::didExitFullscreen() {
 
   if (webMediaPlayer())
     webMediaPlayer()->exitedFullscreen();
+  if (mediaControls())
+    mediaControls()->didExitFullscreen();
   if (m_inOverlayFullscreenVideo)
     document().layoutViewItem().compositor()->setNeedsCompositingUpdate(
         CompositingUpdateRebuildTree);