Motown: ffmpeg implementations of framework 'parts'

services/media/framework_create/demux.cc

 // 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.
 
 #include "services/media/framework/parts/demux.h"
+#include "services/media/framework_ffmpeg/ffmpeg_demux.h"
 
 namespace mojo {
 namespace media {
 
 Result Demux::Create(
     std::shared_ptr<Reader> reader,
     std::shared_ptr<Demux>* demux_out) {
-  return Result::kUnsupportedOperation;
+  std::shared_ptr<Demux> demux = FfmpegDemux::Create();
+
+  Result result = demux->Init(reader);
+  if (result == Result::kOk) {
+    *demux_out = demux;
+  }
+
+  return result;
 }
 
 } // namespace media
 } // namespace mojo