Notify WebMediaPlayer when its ancestor enters/exists fullscreen.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index fdb43c9b95f20f2f20306af96881bb45bbe2a27d..932d1f653a163f4789ee26e8dd3350f4d007ead7 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -351,6 +351,16 @@ void WebMediaPlayerImpl::exitedFullscreen() {
     observer_->OnExitedFullscreen();
 }
 
+void WebMediaPlayerImpl::enteredFullWindow() {
+  if (observer_)
+    observer_->OnEnteredFullscreen();
+}
+
+void WebMediaPlayerImpl::exitedFullWindow() {
+  if (observer_)
+    observer_->OnExitedFullscreen();
+}
+
 void WebMediaPlayerImpl::DoLoad(LoadType load_type,
                                 const blink::WebURL& url,
                                 CORSMode cors_mode) {