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

chromecast/browser/media/cma_message_filter_host.h

Index: chromecast/browser/media/cma_message_filter_host.h
diff --git a/chromecast/browser/media/cma_message_filter_host.h b/chromecast/browser/media/cma_message_filter_host.h
index 763727c5888227aedaa755d59ecf52b4a7bf465f..769e9a331ce842f9b5e50921941ae32c07f30a57 100644
--- a/chromecast/browser/media/cma_message_filter_host.h
+++ b/chromecast/browser/media/cma_message_filter_host.h
@@ -28,6 +28,10 @@ class PointF;
 class Size;
 }
 
+namespace content {

[erickung1, 2015/02/02 21:51:34]

Nit: namespace in alphanumeric order. (move it to namespace gfx above) 

[gunsch, 2015/02/02 23:43:13]

Done.

+class RenderProcessHost;
+}
+
 namespace media {
 class AudioDecoderConfig;
 class BrowserCdm;
@@ -42,7 +46,8 @@ class MediaPipelineHost;
 class CmaMessageFilterHost
     : public content::BrowserMessageFilter {
  public:
-  explicit CmaMessageFilterHost(int render_process_id);
+  explicit CmaMessageFilterHost(
+      content::RenderProcessHost* render_process_host);
 
   // content::BrowserMessageFilter implementation.
   void OnChannelClosing() override;
@@ -63,6 +68,9 @@ class CmaMessageFilterHost
   void CreateMedia(int media_id, LoadType load_type);
   void DestroyMedia(int media_id);
   void SetCdm(int media_id, int render_frame_id, int cdm_id);
+  void SetCdmOnUiThread(MediaPipelineHost* media_pipeline,
+                        int render_frame_id,
+                        int cdm_id);
   void CreateAvPipe(int media_id, TrackId track_id, size_t shared_mem_size);
   void OnAvPipeSet(int media_id,
                    TrackId track_id,
@@ -106,8 +114,8 @@ class CmaMessageFilterHost
                             TrackId track_id,
                             const gfx::Size& size);
 
-  // Render process ID correponding to this message filter.
-  const int process_id_;
+  // Render process host correponding to this message filter.
+  const content::RenderProcessHost* render_process_host_;
 
   // List of media pipeline and message loop media pipelines are running on.
   MediaPipelineMap media_pipelines_;