[wfd] Support a low(er) power state by triggering PAUSE/RESUME.

Change-Id: Ibe42bfa73816bbfeb7e652d435254d0171b89727
related-to-bug: 7638150
diff --git a/include/media/IRemoteDisplay.h b/include/media/IRemoteDisplay.h
index a61704e..c8baae9 100644
--- a/include/media/IRemoteDisplay.h
+++ b/include/media/IRemoteDisplay.h
@@ -39,6 +39,9 @@
 public:
     DECLARE_META_INTERFACE(RemoteDisplay);
 
+    virtual status_t pause() = 0;
+    virtual status_t resume() = 0;
+
     // Disconnects the remote display and stops listening for new connections.
     virtual status_t dispose() = 0;
 };