NOT FOR LANDING Introduce and use WebMediaSession

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 50 matching lines @@
 #include "modules/vr/NavigatorVRDevice.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/exported/WrappedResourceResponse.h"
 #include "platform/network/HTTPParsers.h"
 #include "platform/plugins/PluginData.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebApplicationCacheHost.h"
+#include "public/platform/WebMediaSession.h"
 #include "public/platform/WebMimeRegistry.h"
 #include "public/platform/WebRTCPeerConnectionHandler.h"
 #include "public/platform/WebSecurityOrigin.h"
 #include "public/platform/WebServiceWorkerProvider.h"
 #include "public/platform/WebServiceWorkerProviderClient.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/WebURLError.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebAutofillClient.h"
 #include "public/web/WebCachedURLRequest.h"
@@ skipping 708 matching lines @@
 
     if (!webFrame || !webFrame->client())
         return nullptr;
 
     HTMLMediaElementEncryptedMedia& encryptedMedia = HTMLMediaElementEncryptedMedia::from(htmlMediaElement);
     return adoptPtr(webFrame->client()->createMediaPlayer(webFrame, url,
         client, &encryptedMedia,
         encryptedMedia.contentDecryptionModule()));
 }
 
+PassOwnPtr<WebMediaSession> FrameLoaderClientImpl::createWebMediaSession()
+{
+    if (!m_webFrame->client())
+        return nullptr;
+
+    return adoptPtr(m_webFrame->client()->createMediaSession(m_webFrame));
+}
+
 ObjectContentType FrameLoaderClientImpl::objectContentType(
     const KURL& url,
     const String& explicitMimeType,
     bool shouldPreferPlugInsForImages)
 {
     // This code is based on Apple's implementation from
     // WebCoreSupport/WebFrameBridge.mm.
 
     String mimeType = explicitMimeType;
     if (mimeType.isEmpty()) {
@@ skipping 162 matching lines @@
 
 void FrameLoaderClientImpl::suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType type)
 {
     if (m_webFrame->client()) {
         m_webFrame->client()->suddenTerminationDisablerChanged(
             present, static_cast<WebFrameClient::SuddenTerminationDisablerType>(type));
     }
 }
 
 } // namespace blink