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

third_party/WebKit/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 "modules/mediasession/MediaSession.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
@@ skipping 10 matching lines @@
 MediaSession::MediaSession(std::unique_ptr<WebMediaSession> webMediaSession)
     : m_webMediaSession(std::move(webMediaSession))
 {
     DCHECK(m_webMediaSession);
 }
 
 MediaSession* MediaSession::create(ExecutionContext* context, ExceptionState& exceptionState)
 {
     Document* document = toDocument(context);
     LocalFrame* frame = document->frame();
+    return create(frame, exceptionState);
+}
+
+MediaSession* MediaSession::create(LocalFrame* frame, ExceptionState& exceptionState)
+{
     FrameLoaderClient* client = frame->loader().client();
     std::unique_ptr<WebMediaSession> webMediaSession = client->createWebMediaSession();
     if (!webMediaSession) {
         exceptionState.throwDOMException(NotSupportedError, "Missing platform implementation.");
         return nullptr;
     }
     return new MediaSession(std::move(webMediaSession));
 }
 
 ScriptPromise MediaSession::activate(ScriptState* scriptState)
 {
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     m_webMediaSession->activate(new CallbackPromiseAdapter<void, MediaSessionError>(resolver));
+
     return promise;
 }
 
 ScriptPromise MediaSession::deactivate(ScriptState* scriptState)
 {
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     m_webMediaSession->deactivate(new CallbackPromiseAdapter<void, void>(resolver));
     return promise;
 }
 
 void MediaSession::setMetadata(MediaMetadata* metadata)
 {
     m_metadata = metadata;
+
     if (metadata) {
         WebMediaMetadata webMetadata = (WebMediaMetadata) *metadata;
         m_webMediaSession->setMetadata(&webMetadata);
     } else {
         m_webMediaSession->setMetadata(nullptr);
     }
 }
 
 MediaMetadata* MediaSession::metadata() const
 {
     return m_metadata;
 }
 
 DEFINE_TRACE(MediaSession)
 {
     visitor->trace(m_metadata);
 }
 
 } // namespace blink