[chromecast] Track MediaPipelineBackend used by CastRenderer.

chromecast/browser/media/cast_mojo_media_client.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 CHROMECAST_BROWSER_MEDIA_CAST_MOJO_MEDIA_CLIENT_H_
 #define CHROMECAST_BROWSER_MEDIA_CAST_MOJO_MEDIA_CLIENT_H_
 
 #include "chromecast/browser/media/media_pipeline_backend_factory.h"
 #include "media/mojo/services/mojo_media_client.h"
 
 namespace chromecast {
 namespace media {
 
+class MediaResourceTracker;
 class VideoResolutionPolicy;
 
 class CastMojoMediaClient : public ::media::MojoMediaClient {
  public:
   using CreateCdmFactoryCB =
       base::Callback<std::unique_ptr<::media::CdmFactory>()>;
 
   CastMojoMediaClient(const CreateMediaPipelineBackendCB& create_backend_cb,
                       const CreateCdmFactoryCB& create_cdm_factory_cb,
-                      VideoResolutionPolicy* video_resolution_policy);
+                      VideoResolutionPolicy* video_resolution_policy,
+                      MediaResourceTracker* media_resource_tracker);
   ~CastMojoMediaClient() override;
 
   // MojoMediaClient overrides.
   scoped_refptr<::media::AudioRendererSink> CreateAudioRendererSink(
       const std::string& audio_device_id) override;
   std::unique_ptr<::media::RendererFactory> CreateRendererFactory(
       const scoped_refptr<::media::MediaLog>& media_log) override;
   std::unique_ptr<::media::CdmFactory> CreateCdmFactory(
       ::shell::mojom::InterfaceProvider* interface_provider) override;
 
  private:
   const CreateMediaPipelineBackendCB create_backend_cb_;
   const CreateCdmFactoryCB create_cdm_factory_cb_;
   VideoResolutionPolicy* video_resolution_policy_;
+  MediaResourceTracker* media_resource_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(CastMojoMediaClient);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_MEDIA_CAST_MOJO_MEDIA_CLIENT_H_