NOT FOR LANDING Introduce and use WebMediaSession

Source/modules/mediasession/MediaSession.cpp

 // 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.
 
 #include "config.h"
 #include "modules/mediasession/MediaSession.h"
 
+#include "bindings/core/v8/ScriptState.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/frame/LocalFrame.h"
+#include "core/loader/FrameLoaderClient.h"
+
 namespace blink {
 
-MediaSession* MediaSession::create()
+MediaSession::MediaSession(PassOwnPtr<WebMediaSession> webMediaSession)
+    : m_webMediaSession(webMediaSession)
 {
-    return new MediaSession;
+    ASSERT(m_webMediaSession);
+}
+
+MediaSession* MediaSession::create(ScriptState* scriptState)
+{
+    LocalDOMWindow* domWindow = scriptState->domWindow();
+    LocalFrame* frame = domWindow->frame();
+    FrameLoaderClient* client = frame->loader().client();
+    return new MediaSession(client->createWebMediaSession());
+}
+
+MediaSession* MediaSession::createForTesting(PassOwnPtr<WebMediaSession> webMediaSession)
+{
+    return new MediaSession(webMediaSession);
 }
 
 void MediaSession::activate()
 {
+    m_webMediaSession->activate();
 }
 
 void MediaSession::deactivate()
 {
+    m_webMediaSession->deactivate();
 }
 
 } // namespace blink