Adding mojo MediaSessionClient to support media controls

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/events/EventTarget.h"
 #include "modules/ModulesExport.h"
+#include "mojo/public/cpp/bindings/binding.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/mediasession/media_session.mojom-blink.h"
 #include <memory>
 
 namespace blink {
 
 class MediaMetadata;
 class ScriptState;
 
-class MODULES_EXPORT MediaSession final : public EventTargetWithInlineData {
+class MODULES_EXPORT MediaSession final
+    : public EventTargetWithInlineData,
+      blink::mojom::blink::MediaSessionClient {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static MediaSession* create(ScriptState*);
 
   void setMetadata(MediaMetadata*);
   MediaMetadata* metadata() const;
 
   // EventTarget implementation.
   const WTF::AtomicString& interfaceName() const override;
@@ skipping 17 matching lines @@
   void setOnseekforward(EventListener*);
   void setOnseekbackward(EventListener*);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class MediaSessionTest;
 
   MediaSession(ScriptState*);
 
+  // blink::mojom::blink::MediaSessionClient implementation.
+  void DidReceivedAction(const WTF::String& action) override;
+
   // Returns null when the ExecutionContext is not document.
   mojom::blink::MediaSessionService* getService(ScriptState*);
 
   RefPtr<ScriptState> m_scriptState;
   Member<MediaMetadata> m_metadata;
   mojom::blink::MediaSessionServicePtr m_service;
+  mojo::Binding<blink::mojom::blink::MediaSessionClient> m_clientBinding;
 };
 
 }  // namespace blink
 
 #endif  // MediaSession_h