[MediaSession] Add playbackState attribute to Blink MediaSession and use it to determine playback s…

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/ScriptWrappable.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
@@ skipping 14 matching lines @@
       blink::mojom::blink::MediaSessionClient {
   USING_GARBAGE_COLLECTED_MIXIN(MediaSession);
   DEFINE_WRAPPERTYPEINFO();
   USING_PRE_FINALIZER(MediaSession, dispose);
 
  public:
   static MediaSession* create(ExecutionContext*);
 
   void dispose();
 
+  void setPlaybackState(const String&);
+  String playbackState();
+
   void setMetadata(MediaMetadata*);
   MediaMetadata* metadata() const;
 
   // EventTarget implementation.
   const WTF::AtomicString& interfaceName() const override;
   ExecutionContext* getExecutionContext() const override;
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(play);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(pause);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(playpause);
@@ skipping 17 matching lines @@
   bool removeEventListenerInternal(const AtomicString& eventType,
                                    const EventListener*,
                                    const EventListenerOptions&) override;
 
   // blink::mojom::blink::MediaSessionClient implementation.
   void DidReceiveAction(blink::mojom::blink::MediaSessionAction) override;
 
   // Returns null when the ExecutionContext is not document.
   mojom::blink::MediaSessionService* getService();
 
+  mojom::blink::MediaSessionPlaybackState m_playbackState;
   Member<MediaMetadata> m_metadata;
   mojom::blink::MediaSessionServicePtr m_service;
   mojo::Binding<blink::mojom::blink::MediaSessionClient> m_clientBinding;
 };
 
 }  // namespace blink
 
 #endif  // MediaSession_h