[chromecast] Bind and run mojo media services on cma thread.

chromecast/browser/media/BUILD.gn

Index: chromecast/browser/media/BUILD.gn
diff --git a/chromecast/browser/media/BUILD.gn b/chromecast/browser/media/BUILD.gn
index d0414661db33c84c925defbf494adc105dc6f39f..486414b4ea43e53b9c8bfc110db871acac0f94de 100644
--- a/chromecast/browser/media/BUILD.gn
+++ b/chromecast/browser/media/BUILD.gn
@@ -18,6 +18,8 @@ source_set("media") {
 
   if (mojo_media_host == "browser") {
     sources += [
+      "cast_mojo_media_application.cc",
+      "cast_mojo_media_application.h",
       "cast_mojo_media_client.cc",
       "cast_mojo_media_client.h",
       "cast_renderer.cc",
@@ -31,7 +33,9 @@ source_set("media") {
 
   if (mojo_media_host == "browser") {
     public_deps = [
+      "//media/mojo/interfaces",
       "//media/mojo/services:application",
+      "//mojo/shell/public/cpp",
     ]
   }