Refactor media out of WebContentsImpl to MediaWebContentsObserver.

content/browser/media/media_web_contents_observer.h

 // Copyright 2014 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_MEDIA_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 
+#include <map>
+#include <set>
+#include <vector>
+
 #include "base/compiler_specific.h"
 #include "base/containers/scoped_ptr_hash_map.h"
+#include "content/browser/power_save_blocker_impl.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 
 class BrowserCdmManager;
 class BrowserMediaPlayerManager;
 
 // This class manages all RenderFrame based media related managers at the
 // browser side. It receives IPC messages from media RenderFrameObservers and
 // forwards them to the corresponding managers. The managers are responsible
 // for sending IPCs back to the RenderFrameObservers at the render side.
 class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
  public:
   explicit MediaWebContentsObserver(WebContents* web_contents);
   ~MediaWebContentsObserver() override;
 
-  // WebContentsObserver implementations.
+  // Called when the audible state has changed.  If inaudible any audio power
+  // save blockers are released.
+  void MaybeUpdateAudibleState(bool recently_audible);
+
+  // WebContentsObserver implementation.
   void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
+  bool OnMessageReceived(const IPC::Message& message,
+                         RenderFrameHost* render_frame_host) override;
+  void WasShown() override;
+  void WasHidden() override;
 
 #if defined(OS_ANDROID)
-  bool OnMessageReceived(const IPC::Message& message,
-                         RenderFrameHost* render_frame_host) override;
-
-  // 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);
-
   // Gets the media player manager associated with |render_frame_host|. Creates
   // a new one if it doesn't exist. The caller doesn't own the returned pointer.
   BrowserMediaPlayerManager* GetMediaPlayerManager(
       RenderFrameHost* render_frame_host);
 
-  void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
-
 #if defined(VIDEO_HOLE)
   void OnFrameInfoUpdated();
 #endif  // defined(VIDEO_HOLE)
+#endif  // defined(OS_ANDROID)
+
+  bool has_audio_power_save_blocker_for_testing() const {
+    return audio_power_save_blocker_;
+  }
+
+  bool has_video_power_save_blocker_for_testing() const {
+    return video_power_save_blocker_;
+  }
 
  private:
+  bool OnMediaPlayerDelegateMessageReceived(const IPC::Message& message,
+                                            RenderFrameHost* render_frame_host);
+
+  void OnMediaPlayingNotification(RenderFrameHost* render_frame_host,
+                                  int64_t player_cookie,
+                                  bool has_video,
+                                  bool has_audio,
+                                  bool is_remote);
+  void OnMediaPausedNotification(RenderFrameHost* render_frame_host,
+                                 int64_t player_cookie);
+
+  // Clear |render_frame_host|'s tracking entry for its power save blockers.
+  void ClearPowerSaveBlockers(RenderFrameHost* render_frame_host);
+
+  // Creates an audio or video power save blocker respectively.
+  void CreateAudioPowerSaveBlocker();
+  void CreateVideoPowerSaveBlocker();
+
+  // Releases the audio power save blockers if |active_audio_players_| is empty.
+  // Likewise, releases the video power save blockers if |active_video_players_|
+  // is empty.
+  void MaybeReleasePowerSaveBlockers();
+
+  // Helper methods for adding or removing player entries in |player_map|.
+  using PlayerList = std::vector<int64_t>;
+  using ActiveMediaPlayerMap = std::map<RenderFrameHost*, PlayerList>;
+  void AddMediaPlayerEntry(const MediaPlayerId& id,
+                           ActiveMediaPlayerMap* player_map);
+  // Returns true if an entry is actually removed.
+  bool RemoveMediaPlayerEntry(const MediaPlayerId& id,
+                              ActiveMediaPlayerMap* player_map);
+  // Removes all entries from |player_map| for |render_frame_host|. Removed
+  // entries are added to |removed_players|.
+  void RemoveAllMediaPlayerEntries(RenderFrameHost* render_frame_host,
+                                   ActiveMediaPlayerMap* player_map,
+                                   std::set<MediaPlayerId>* removed_players);
+
+#if defined(OS_ANDROID)
+  // 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);
+
+  void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
+
   // Map from RenderFrameHost* to BrowserMediaPlayerManager.
-  typedef base::ScopedPtrHashMap<uintptr_t,
-                                 scoped_ptr<BrowserMediaPlayerManager>>
-      MediaPlayerManagerMap;
+  using MediaPlayerManagerMap =
+      base::ScopedPtrHashMap<RenderFrameHost*,
+                             scoped_ptr<BrowserMediaPlayerManager>>;
   MediaPlayerManagerMap media_player_managers_;
 #endif  // defined(OS_ANDROID)
 
- private:
+  // Tracking variables and associated power save blockers for media playback.
+  ActiveMediaPlayerMap active_audio_players_;
+  ActiveMediaPlayerMap active_video_players_;
+  scoped_ptr<PowerSaveBlocker> audio_power_save_blocker_;
+  scoped_ptr<PowerSaveBlocker> video_power_save_blocker_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_