Chromecast: CmaMessageFilterHost SetCdm threading change.

chromecast/browser/media/cma_message_loop.h

Index: chromecast/browser/media/cma_message_loop.h
diff --git a/chromecast/browser/media/cma_message_loop.h b/chromecast/browser/media/cma_message_loop.h
index 826999fa5af45e82092e67eefc5cd8918aec3fa2..5ce2cd40c836bc5b1b6eb94e8550a846bd5e2b32 100644
--- a/chromecast/browser/media/cma_message_loop.h
+++ b/chromecast/browser/media/cma_message_loop.h
@@ -11,6 +11,7 @@
 
 namespace base {
 class MessageLoopProxy;
+class SingleThreadTaskRunner;
 class Thread;
 }
 
@@ -19,7 +20,9 @@ namespace media {
 
 class CmaMessageLoop {
  public:
+  // TODO(gunsch): clean up references to deprecated Message*Loop*Proxy.
   static scoped_refptr<base::MessageLoopProxy> GetMessageLoopProxy();
+  static scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner();
 
  private:
   friend struct DefaultSingletonTraits<CmaMessageLoop>;