Adds keyboard functionality for videos.

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MediaControls_h
 #define MediaControls_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "platform/heap/Visitor.h"
 
 namespace blink {
 
 class Document;
+class Event;
 class HTMLMediaElement;
 class LayoutObject;
 class MediaControlPanelElement;
 class ShadowRoot;
 
 // MediaControls is an interface to abstract the HTMLMediaElement controls. The
 // implementation will be used using a Factory (see below).
 class CORE_EXPORT MediaControls : public GarbageCollectedMixin {
  public:
   // Factory class that HTMLMediaElement uses to create the MediaControls
@@ skipping 53 matching lines @@
   virtual void EndScrubbing() = 0;
   virtual void UpdateCurrentTimeDisplay() = 0;
   virtual void ToggleTextTrackList() = 0;
   virtual void ShowTextTrackAtIndex(unsigned) = 0;
   virtual void DisableShowingTextTracks() = 0;
   virtual void EnterFullscreen() = 0;
   virtual void ExitFullscreen() = 0;
   virtual void ToggleOverflowMenu() = 0;
   virtual bool OverflowMenuVisible() = 0;
   virtual void OnMediaControlsEnabledChange() = 0;
+  virtual void OnMediaKeyboardEvent(Event*) = 0;

[mlamouri (slow - plz ping), 2017/04/13 14:28:21]

I don't think you need this.

[CJ, 2017/04/14 21:56:45]

Done.

 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   Member<HTMLMediaElement> media_element_;
 };
 
 }  // namespace blink
 
 #endif  // MediaControls_h