Cast: Flow hw encoder initialization error to extensions API

media/cast/test/simulator.cc

 // Copyright 2014 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.
 
 // Simulate end to end streaming.
 //
 // Input:
 // --source=
 //   WebM used as the source of video and audio frames.
 // --output=
@@ skipping 292 matching lines @@
                                &testing_clock,
                                video_sender_config);
 
   // Initializing audio and video senders.
   cast_sender->InitializeAudio(audio_sender_config,
                                base::Bind(&AudioInitializationStatus));
   cast_sender->InitializeVideo(media_source.get_video_config(),
                                base::Bind(&VideoInitializationStatus),
                                CreateDefaultVideoEncodeAcceleratorCallback(),
                                CreateDefaultVideoEncodeMemoryCallback());
+  task_runner->RunTasks();
 
   // Start sending.
   if (!source_path.empty()) {
     // 0 means using the FPS from the file.
     media_source.SetSourceFile(source_path, 0);
   }
   media_source.Start(cast_sender->audio_frame_input(),
                      cast_sender->video_frame_input());
 
   // Run for 3 minutes.
@@ skipping 188 matching lines @@
   values.SetBoolean("sim", true);
   values.SetString("sim-id", sim_id);
 
   std::string extra_data;
   base::JSONWriter::Write(&values, &extra_data);
 
   // Run.
   media::cast::RunSimulation(source_path, output_path, extra_data, model);
   return 0;
 }