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

services/media/factory_service/media_player_impl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SERVICES_MEDIA_FACTORY_MEDIA_PLAYER_IMPL_H_
 #define MOJO_SERVICES_MEDIA_FACTORY_MEDIA_PLAYER_IMPL_H_
 
 #include <deque>
 #include <limits>
 #include <vector>
@@ skipping 85 matching lines @@
 
   // Increments the status version and runs pending status request callbacks.
   void StatusUpdated();
 
   // Runs a status request callback.
   void RunStatusCallback(const GetStatusCallback& callback) const;
 
   // 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_;
   Binding<MediaPlayer> binding_;
   MediaFactoryPtr factory_;
   MediaSourcePtr source_;
   std::vector<std::unique_ptr<Stream>> streams_;
   uint64_t status_version_ = 1u;
   bool flushed_ = true;
   MediaState reported_media_state_ = MediaState::UNPREPARED;
   Watched<MediaState> target_state_;
   Watched<int64_t> target_position_;
   TimelineTransformPtr transform_;
   MediaMetadataPtr metadata_;
   std::deque<GetStatusCallback> pending_status_requests_;
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_MEDIA_FACTORY_MEDIA_PLAYER_IMPL_H_