[WIP] Proxy RtcVideoDecoder calls to a media::VideoDecoder.

chromecast/browser/cast_content_browser_client.h

Index: chromecast/browser/cast_content_browser_client.h
diff --git a/chromecast/browser/cast_content_browser_client.h b/chromecast/browser/cast_content_browser_client.h
index 5a3cfcc72aa126dfb522b77dc6d21b4518029f6f..f5f5a55faa9a25f0bbe4175fd8be436e926b0fb9 100644
--- a/chromecast/browser/cast_content_browser_client.h
+++ b/chromecast/browser/cast_content_browser_client.h
@@ -37,6 +37,7 @@ namespace chromecast {
 class CastService;
 
 namespace media {
+class CastMojoMediaClient;
 class MediaCapsImpl;
 class MediaPipelineBackend;
 class MediaPipelineBackendManager;
@@ -205,6 +206,10 @@ class CastContentBrowserClient : public content::ContentBrowserClient {
   CastBrowserMainParts* cast_browser_main_parts_;
   std::unique_ptr<URLRequestContextFactory> url_request_context_factory_;
 
+  // This is the MojoMediaClient used for media mojo interfaces exposed to the
+  // renderer process.
+  std::unique_ptr<media::CastMojoMediaClient> cast_mojo_media_client_;
+
   DISALLOW_COPY_AND_ASSIGN(CastContentBrowserClient);
 };