Hook up RendererMediaSessionManager with browser side

content/renderer/media/android/webmediasession_android.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_WEBMEDIASESSION_ANDROID_H_
 #define CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIASESSION_ANDROID_H_
 
+#include "base/id_map.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h"
 
 namespace content {
 
 class RendererMediaSessionManager;
 
 class CONTENT_EXPORT WebMediaSessionAndroid : public blink::WebMediaSession {
  public:
   WebMediaSessionAndroid(RendererMediaSessionManager* session_manager);
   virtual ~WebMediaSessionAndroid() override;
 
   void activate(blink::WebMediaSessionActivateCallback*) override;
   void deactivate(blink::WebMediaSessionDeactivateCallback*) override;
 
+  void OnDidActivate(int request_id, bool success);
+  void OnDidDeactivate(int request_id);
+
+  int session_id() const { return session_id_; }
+
  private:
   RendererMediaSessionManager* const session_manager_;
   int session_id_;
+  int next_request_id_;
+
+  using ActivationRequests =
+      IDMap<blink::WebMediaSessionActivateCallback, IDMapOwnPointer>;
+  ActivationRequests activation_requests_;
+
+  using DeactivationRequests =
+      IDMap<blink::WebMediaSessionDeactivateCallback, IDMapOwnPointer>;
+  DeactivationRequests deactivation_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaSessionAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIASESSION_ANDROID_H_