Replace FFmpegDemuxer thread per element with base::TaskScheduler.

media/test/pipeline_integration_test_base.cc

 // Copyright (c) 2012 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 "media/test/pipeline_integration_test_base.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 292 matching lines @@
       base::TimeDelta::FromMilliseconds(10));
   base::RunLoop().Run();
   return (pipeline_status_ == PIPELINE_OK);
 }
 
 void PipelineIntegrationTestBase::CreateDemuxer(
     std::unique_ptr<DataSource> data_source) {
   data_source_ = std::move(data_source);
 
 #if !defined(MEDIA_DISABLE_FFMPEG)
+  task_scheduler_.reset(new base::test::ScopedTaskScheduler(&message_loop_));
   demuxer_ = std::unique_ptr<Demuxer>(new FFmpegDemuxer(
       message_loop_.task_runner(), data_source_.get(),
       base::Bind(&PipelineIntegrationTestBase::DemuxerEncryptedMediaInitDataCB,
                  base::Unretained(this)),
       base::Bind(&PipelineIntegrationTestBase::DemuxerMediaTracksUpdatedCB,
                  base::Unretained(this)),
       new MediaLog()));
 #endif
 }
 
@@ skipping 119 matching lines @@
   DCHECK(clockless_playback_);
   return clockless_audio_sink_->render_time();
 }
 
 base::TimeTicks DummyTickClock::NowTicks() {
   now_ += base::TimeDelta::FromSeconds(60);
   return now_;
 }
 
 }  // namespace media