Motown: Add examples/media_test, a command line media player app.

services/media/factory_service/media_player_impl.h

Index: services/media/factory_service/media_player_impl.h
diff --git a/services/media/factory_service/media_player_impl.h b/services/media/factory_service/media_player_impl.h
index d871eba6f3b78a1893fd6ad4343aaaae9022739f..b3b3c9e5cccd3b372f78304c48d5bb48068be46f 100644
--- a/services/media/factory_service/media_player_impl.h
+++ b/services/media/factory_service/media_player_impl.h
@@ -103,14 +103,14 @@ class MediaPlayerImpl
   // Handles a status update from the source. When called with the default
   // argument values, initiates source status updates.
   void HandleSourceStatusUpdates(
-      uint64_t version = 0,
+      uint64_t version = MediaSource::kInitialStatus,
       MediaSourceStatusPtr status = nullptr);
 
   // Handles a status update from a sink. When called with the default
   // argument values, initiates sink status updates.
   void HandleSinkStatusUpdates(
       const std::unique_ptr<Stream>& stream,
-      uint64_t version = 0,
+      uint64_t version = MediaSink::kInitialStatus,
       MediaSinkStatusPtr status = nullptr);
 
   Event event_;