Media Controls: add comments regarding cast/remote related calls from element.

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

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.h
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.h b/third_party/WebKit/Source/core/html/shadow/MediaControls.h
index 5112210f4c3a7b180a07304b49295f12396858b9..2b520c58f1fb7feb9c5d0fc110986ee6f751af63 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.h
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.h
@@ -65,9 +65,6 @@ class CORE_EXPORT MediaControls final : public HTMLDivElement {
   void enteredFullscreen();
   void exitedFullscreen();
 
-  void startedCasting();
-  void stoppedCasting();
-  void refreshCastButtonVisibility();
   void showOverlayCastButtonIfNeeded();
   // Update cast button visibility, but don't try to update our panel
   // button visibility for space.
@@ -103,6 +100,18 @@ class CORE_EXPORT MediaControls final : public HTMLDivElement {
   // be notified on the TextTrack object. See https://crbug.com/669977
   void onTrackElementFailedToLoad() { onTextTracksAddedOrRemoved(); }
 
+  // TODO(mlamouri): the following methods will be able to become private when
+  // the controls have moved to modules/ and have access to RemotePlayback.
+  void onRemotePlaybackAvailabilityChanged() { refreshCastButtonVisibility(); }
+  void onRemotePlaybackConnecting() { startedCasting(); }
+  void onRemotePlaybackDisconnected() { stoppedCasting(); }
+
+  // TODO(mlamouri): this method is needed in order to notify the controls that
+  // the attribute have changed.
+  void onDisableRemotePlaybackAttributeChanged() {
+    refreshCastButtonVisibility();
+  }
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
@@ -163,6 +172,11 @@ class CORE_EXPORT MediaControls final : public HTMLDivElement {
   void onError();
   void onLoadedMetadata();
 
+  // Internal cast related methods.
+  void startedCasting();
+  void stoppedCasting();
+  void refreshCastButtonVisibility();
+
   Member<HTMLMediaElement> m_mediaElement;
 
   // Media control elements.