Move MediaControlsWindowEventListener to modules/media_controls/.

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 69 matching lines @@
   void onDisableRemotePlaybackAttributeChanged() override {
     refreshCastButtonVisibility();
   }
   // Notify us that the media element's network state has changed.
   void networkStateChanged() override;
   LayoutObject* panelLayoutObject() override;
   LayoutObject* containerLayoutObject() override;
   // Return the internal elements, which is used by registering clicking
   // EventHandlers from MediaControlsWindowEventListener.
   MediaControlPanelElement* panelElement() override { return m_panel; }
-  MediaControlTimelineElement* timelineElement() override { return m_timeline; }
-  MediaControlCastButtonElement* castButtonElement() override {
-    return m_castButton;
-  }
-  MediaControlVolumeSliderElement* volumeSliderElement() override {
-    return m_volumeSlider;
-  }
   void beginScrubbing() override;
   void endScrubbing() override;
   void updateCurrentTimeDisplay() override;
   void toggleTextTrackList() override;
   void showTextTrackAtIndex(unsigned indexToEnable) override;
   void disableShowingTextTracks() override;
   // Called by the fullscreen buttons to toggle fulllscreen on/off.
   void enterFullscreen() override;
   void exitFullscreen() override;
   void showOverlayCastButtonIfNeeded() override;
@@ skipping 16 matching lines @@
   void onTextTracksChanged() override;
   void onError() override;
   void onLoadedMetadata() override;
   void onEnteredFullscreen() override;
   void onExitedFullscreen() override;
   Document& ownerDocument() { return document(); }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
+  // For composition.

[whywhat, 2017/04/07 20:13:59]

nit: what does composition mean here? As in "composition vs inheritance"?
Maybe rather explain what these classes need access to that can't be exposed in
other ways?

[mlamouri (slow - plz ping), 2017/04/09 15:36:41]

I gave more details.

   friend class MediaControlsMediaEventListener;
+  friend class MediaControlsWindowEventListener;
+
+  // For tests.
   friend class MediaControlsOrientationLockDelegateTest;
   friend class MediaControlsImplTest;
 
   // Need to be members of MediaControls for private member access.
   class BatchedControlUpdate;
   class MediaControlsResizeObserverCallback;
 
   static MediaControlsImpl* create(HTMLMediaElement&, ShadowRoot&);
 
   void invalidate(Element*);
@@ skipping 85 matching lines @@
   IntSize m_size;
 
   bool m_keepShowingUntilTimerFires : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControlsImpl, isMediaControls());
 
 }  // namespace blink
 
 #endif