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 cdebe7739579127cc1db0a4aadd49269324e37b7..23973d00fc2c864ee286cac70b0f5e9ddd588d2b 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -341,6 +341,22 @@ void WebMediaPlayerImpl::exitedFullscreen() {
     DisableOverlay();
 }
 
+void WebMediaPlayerImpl::enterFullWindow() {
+  is_full_window_ = true;
+  // TODO(xjz): merges with cl: https://codereview.chromium.org/2389473002/ to
+  // notify the MediaObserver.
+}
+
+bool WebMediaPlayerImpl::isFullWindow() {
+  return is_full_window_;
+}
+
+void WebMediaPlayerImpl::exitFullWindow() {
+  is_full_window_ = false;
+  // TODO(xjz): merges with cl: https://codereview.chromium.org/2389473002/ to
+  // notify the MediaObserver.
+}
+
 void WebMediaPlayerImpl::DoLoad(LoadType load_type,
                                 const blink::WebURL& url,
                                 CORSMode cors_mode) {