Make MediaSession a runtime-enabled feature on Desktop.

content/browser/media/android/media_web_contents_observer_android.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_WEB_CONTENTS_OBSERVER_ANDROID_H_
 #define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_
 
 #include <stdint.h>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/media/media_web_contents_observer.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class BrowserCdmManager;
 class BrowserMediaPlayerManager;
 class BrowserMediaSessionManager;
-class MediaSessionController;
 
 // This class adds Android specific extensions to the MediaWebContentsObserver.
 class CONTENT_EXPORT MediaWebContentsObserverAndroid
     : public MediaWebContentsObserver {
  public:
   explicit MediaWebContentsObserverAndroid(WebContents* web_contents);
   ~MediaWebContentsObserverAndroid() override;
 
   // Returns the android specific observer for a given web contents.
   static MediaWebContentsObserverAndroid* FromWebContents(
       WebContents* web_contents);
 
   // Gets the media player or media session manager associated with the given
   // |render_frame_host| respectively. Creates a new one if it doesn't exist.
   // The caller doesn't own the returned pointer.
   BrowserMediaPlayerManager* GetMediaPlayerManager(
       RenderFrameHost* render_frame_host);
   BrowserMediaSessionManager* GetMediaSessionManager(
       RenderFrameHost* render_frame_host);
 
   // Called by the WebContents when a tab has been closed but may still be
   // available for "undo" -- indicates that all media players (even audio only
   // players typically allowed background audio) bound to this WebContents must
   // be suspended.
   void SuspendAllMediaPlayers();
 
-  // Initiates a synchronous MediaSession request for browser side players.
-  //
-  // TODO(dalecurtis): Delete this method once we're no longer using WMPA and
-  // the BrowserMediaPlayerManagers.  Tracked by http://crbug.com/580626
-  bool RequestPlay(RenderFrameHost* render_frame_host,
-                   int delegate_id,
-                   bool has_audio,
-                   bool is_remote,
-                   base::TimeDelta duration);
-
 #if defined(VIDEO_HOLE)
   void OnFrameInfoUpdated();
 #endif  // defined(VIDEO_HOLE)
 
   // MediaWebContentsObserverAndroid overrides.
   void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
   bool OnMessageReceived(const IPC::Message& message,
                          RenderFrameHost* render_frame_host) override;
 
  private:
-  // Handles messages from the WebMediaPlayerDelegate; does not modify the
-  // handled state since the superclass needs to handle these as well.
-  void OnMediaPlayerDelegateMessageReceived(const IPC::Message& msg,
-                                            RenderFrameHost* render_frame_host);
-  void OnMediaDestroyed(RenderFrameHost* render_frame_host, int delegate_id);
-  void OnMediaPaused(RenderFrameHost* render_frame_host,
-                     int delegate_id,
-                     bool reached_end_of_stream);
-  void OnMediaPlaying(RenderFrameHost* render_frame_host,
-                      int delegate_id,
-                      bool has_video,
-                      bool has_audio,
-                      bool is_remote,
-                      base::TimeDelta duration);
-
   // Helper functions to handle media player IPC messages. Returns whether the
   // |message| is handled in the function.
   bool OnMediaPlayerMessageReceived(const IPC::Message& message,
                                     RenderFrameHost* render_frame_host);
 
   bool OnMediaPlayerSetCdmMessageReceived(const IPC::Message& message,
                                           RenderFrameHost* render_frame_host);
 
   bool OnMediaSessionMessageReceived(const IPC::Message& message,
                                      RenderFrameHost* render_frame_host);
 
   void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
 
   // Map from RenderFrameHost* to BrowserMediaPlayerManager.
   using MediaPlayerManagerMap =
       base::ScopedPtrHashMap<RenderFrameHost*,
                              scoped_ptr<BrowserMediaPlayerManager>>;
   MediaPlayerManagerMap media_player_managers_;
 
   // Map from RenderFrameHost* to BrowserMediaSessionManager.
   using MediaSessionManagerMap =
       base::ScopedPtrHashMap<RenderFrameHost*,
                              scoped_ptr<BrowserMediaSessionManager>>;
   MediaSessionManagerMap media_session_managers_;
 
-  // Map of renderer process media players to session controllers.
-  using MediaSessionMap =
-      std::map<MediaPlayerId, scoped_ptr<MediaSessionController>>;
-  MediaSessionMap media_session_map_;
-
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserverAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_ANDROID_H_