NOT FOR LANDING Introduce and use WebMediaSession

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/ScriptWrappable.h"
+#include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
+#include "public/platform/WebMediaSession.h"
+#include "wtf/OwnPtr.h"
 
 namespace blink {
 
-class MediaSession : public GarbageCollected<MediaSession>, public ScriptWrappable {
+class ScriptState;
+class WebMediaSession;
+
+class MODULES_EXPORT MediaSession

[whywhat, 2015/08/24 14:30:03]

Please, add some comments for the class and its (at least public) members.

+    : public GarbageCollectedFinalized<MediaSession>
+    , public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static MediaSession* create();
+    static MediaSession* create(ScriptState*);
+    static MediaSession* createForTesting(PassOwnPtr<WebMediaSession>);
 
     void activate();
     void deactivate();
 
     DEFINE_INLINE_TRACE() { }
 
 private:
-    MediaSession() = default;
+    MediaSession(PassOwnPtr<WebMediaSession>);

[whywhat, 2015/08/24 14:30:03]

nit: use explicit keyword

+
+    OwnPtr<WebMediaSession> m_webMediaSession;

[whywhat, 2015/08/24 14:30:03]

Shouldn't this live on the Oilpan heap (e.g. be a Member)?

 };
 
 } // namespace blink
 
 #endif // MediaSession_h