Add render-side manager for MediaSession

content/renderer/media/android/renderer_media_session_manager.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 CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_SESSION_MANAGER_H_
+#define CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_SESSION_MANAGER_H_
+
+#include <map>
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace content {
+
+class WebMediaSessionAndroid;
+
+class CONTENT_EXPORT RendererMediaSessionManager : public RenderFrameObserver {
+ public:
+  RendererMediaSessionManager(RenderFrame* render_frame);
+  ~RendererMediaSessionManager() override;
+
+  int RegisterMediaSession(WebMediaSessionAndroid* session);
+  void UnregisterMediaSession(int session_id);
+
+ private:
+  friend class WebMediaSessionTest;
+
+  std::map<int, WebMediaSessionAndroid*> sessions_;
+  int next_session_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(RendererMediaSessionManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_SESSION_MANAGER_H_