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();

[haraken, 2016/10/17 22:37:05]

You need to add USING_PRE_FINALIZER and clear m_clientBinding in the
pre-finalizer.

See
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/nfc/NF...

(This issue will be fixed soon so that developers don't need to worry about the
pre-finalizer.)

[Zhiqiang Zhang (Slow), 2016/10/18 14:42:14]

Thanks! Done.

 
  public:
   static MediaSession* create(ScriptState*);
 
   void setMetadata(MediaMetadata*);
   MediaMetadata* metadata() const;
 
   // EventTarget implementation.
   const WTF::AtomicString& interfaceName() const override;
   ExecutionContext* getExecutionContext() const override;
@@ skipping 15 matching lines @@
 
   // EventTarget overrides
   bool addEventListenerInternal(
       const AtomicString& eventType,
       EventListener*,
       const AddEventListenerOptionsResolved&) override;
   bool removeEventListenerInternal(const AtomicString& eventType,
                                    const EventListener*,
                                    const EventListenerOptions&) override;
 
+  // blink::mojom::blink::MediaSessionClient implementation.
+  void DidReceivedAction(blink::mojom::blink::MediaSessionAction) 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