[Blink>MediaSession] Use setActionCallback() instead of event listeners for media control actions

third_party/WebKit/Source/modules/mediasession/NavigatorMediaSession.h

 // Copyright 2016 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 NavigatorMediaSession_h
 #define NavigatorMediaSession_h
 
+#include "bindings/core/v8/ScriptState.h"

[mlamouri (slow - plz ping), 2016/12/20 13:25:58]

why?

[Zhiqiang Zhang (Slow), 2016/12/20 13:53:06]

This is because I removed some #include from MediaSession.h and ScriptState is
not here anymore.

Anyway, we need to declare ScriptState regardless of whether we include
MediaSession.h, so I now forward-declare it and include the header in the .cpp
file.

 #include "core/frame/Navigator.h"
 #include "modules/mediasession/MediaSession.h"
 #include "platform/Supplementable.h"
 
 namespace blink {
 
 class Navigator;
 
 // Provides MediaSession as a supplement of Navigator as an attribute.
 class NavigatorMediaSession final
@@ skipping 11 matching lines @@
   NavigatorMediaSession(Navigator&);
   static const char* supplementName();
 
   // The MediaSession instance of this Navigator.
   Member<MediaSession> m_session;
 };
 
 }  // namespace blink
 
 #endif  // NavigatorMediaSession_h