Make MediaSession available on Desktop

content/browser/media/android/media_session_service_impl.h

-// Copyright 2016 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 CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_SERVICE_IMPL_H_
-#define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_SERVICE_IMPL_H_
-
-#include "mojo/public/cpp/bindings/binding.h"
-#include "third_party/WebKit/public/platform/modules/mediasession/media_session.mojom.h"
-
-namespace content {
-
-class RenderFrameHost;
-
-class MediaSessionServiceImpl : public blink::mojom::MediaSessionService {
- public:
-  ~MediaSessionServiceImpl() override;
-
-  static void Create(RenderFrameHost* render_frame_host,
-                     blink::mojom::MediaSessionServiceRequest request);
-
- private:
-  explicit MediaSessionServiceImpl(RenderFrameHost* render_frame_host);
-
-  void SetMetadata(
-      const base::Optional<content::MediaMetadata>& metadata) override;
-
-  void Bind(blink::mojom::MediaSessionServiceRequest request);
-
-  RenderFrameHost* render_frame_host_;
-
-  // RAII binding of |this| to an MediaSession interface request.
-  // The binding is removed when binding_ is cleared or goes out of scope.
-  std::unique_ptr<mojo::Binding<blink::mojom::MediaSessionService>> binding_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaSessionServiceImpl);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_SERVICE_IMPL_H_