Implement MediaSession (metadata) per frame [NOT READY, HAS DEPENDENCY]

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

 // Copyright 2015 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 MediaSession_h
 #define MediaSession_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/mediasession/WebMediaSession.h"
 #include <memory>
 
 namespace blink {
 
+class LocalFrame;
 class MediaMetadata;
 class ScriptState;
 
 class MODULES_EXPORT MediaSession final
     : public GarbageCollectedFinalized<MediaSession>
     , public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static MediaSession* create(ExecutionContext*, ExceptionState&);
+    static MediaSession* create(LocalFrame*, ExceptionState&);
 
     WebMediaSession* getWebMediaSession() { return m_webMediaSession.get(); }
 
     ScriptPromise activate(ScriptState*);
     ScriptPromise deactivate(ScriptState*);
 
     void setMetadata(MediaMetadata*);
     MediaMetadata* metadata() const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     friend class MediaSessionTest;
 
     explicit MediaSession(std::unique_ptr<WebMediaSession>);
 
     std::unique_ptr<WebMediaSession> m_webMediaSession;
     Member<MediaMetadata> m_metadata;
 };
 
 } // namespace blink
 
 #endif // MediaSession_h