Chromecast: use PlayerTrackerImpl in BrowserCdmCast.

chromecast/media/cdm/browser_cdm_cast.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 CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_
 #define CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/browser_cdm.h"
+#include "media/cdm/player_tracker_impl.h"
 
 namespace chromecast {
 namespace media {
 class DecryptContext;
 
 // BrowserCdmCast is an extension of BrowserCdm that provides common
 // functionality across CDM implementations.
 // All these additional functions are synchronous so:
 // - either both the CDM and the media pipeline must be running on the same
 //   thread,
 // - or BrowserCdmCast implementations must use some locks.
 //
 class BrowserCdmCast : public ::media::BrowserCdm {
  public:
   BrowserCdmCast();
   ~BrowserCdmCast() override;
 
   // PlayerTracker implementation.
   int RegisterPlayer(const base::Closure& new_key_cb,
                      const base::Closure& cdm_unset_cb) override;
   void UnregisterPlayer(int registration_id) override;
 
   // Returns the decryption context needed to decrypt frames encrypted with
   // |key_id|.
   // Returns null if |key_id| is not available.
   virtual scoped_refptr<DecryptContext> GetDecryptContext(
       const std::string& key_id) const = 0;
 
  protected:
-  // Notifies all listeners a new key was added on the next message loop cycle.
-  void NotifyKeyAdded() const;
+  // Notifies all listeners a new key was added.
+  void NotifyKeyAdded();
 
  private:
-  uint32_t next_registration_id_;
-  std::map<uint32_t, base::Closure> new_key_callbacks_;
-  std::map<uint32_t, base::Closure> cdm_unset_callbacks_;
+  ::media::PlayerTrackerImpl player_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCdmCast);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_