Adds hook for content embedders to get media::BrowserCdm*.

chromecast/browser/media/media_pipeline_host.h

Index: chromecast/browser/media/media_pipeline_host.h
diff --git a/chromecast/browser/media/media_pipeline_host.h b/chromecast/browser/media/media_pipeline_host.h
index ccbb7c6f3443ff2ebdf1f73693ffa57a4def2f90..32b9cdb7586e1b259ac56438ec6bc38f0c64ef14 100644
--- a/chromecast/browser/media/media_pipeline_host.h
+++ b/chromecast/browser/media/media_pipeline_host.h
@@ -24,6 +24,7 @@ class SingleThreadTaskRunner;
 
 namespace media {
 class AudioDecoderConfig;
+class BrowserCdm;
 class VideoDecoderConfig;
 }
 
@@ -60,7 +61,7 @@ class MediaPipelineHost {
 
   void SetPlaybackRate(float playback_rate);
   void SetVolume(TrackId track_id, float playback_rate);
-  void SetCdm(int render_process_id, int render_frame_id, int cdm_id);
+  void SetCdm(::media::BrowserCdm* cdm);
 
   void NotifyPipeWrite(TrackId track_id);