[chromecast] Track MediaPipelineBackend used by CastRenderer.

chromecast/browser/cast_content_browser_client.cc

Index: chromecast/browser/cast_content_browser_client.cc
diff --git a/chromecast/browser/cast_content_browser_client.cc b/chromecast/browser/cast_content_browser_client.cc
index a4b1d4034aa6735fb3b20408a8d125053df795a0..7774607c7ddf01f421b4bbea24bbfc88bffc8630 100644
--- a/chromecast/browser/cast_content_browser_client.cc
+++ b/chromecast/browser/cast_content_browser_client.cc
@@ -83,7 +83,8 @@ static std::unique_ptr<::shell::Service> CreateMojoMediaApplication(
                      base::Unretained(browser_client)),
           base::Bind(&CastContentBrowserClient::CreateCdmFactory,
                      base::Unretained(browser_client)),
-          browser_client->GetVideoResolutionPolicy()));
+          browser_client->GetVideoResolutionPolicy(),
+          browser_client->media_resource_tracker()));
   return std::unique_ptr<::shell::Service>(
       new ::media::MojoMediaApplication(std::move(mojo_media_client),
                                         quit_closure));