Replace FFmpegDemuxer thread per element with base::TaskScheduler.

media/test/run_all_unittests.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 "base/bind.h"
 #include "base/command_line.h"
+#include "base/task_scheduler/task_scheduler.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_discardable_memory_allocator.h"
 #include "base/test/test_suite.h"
 #include "build/build_config.h"
 #include "media/base/fake_localized_strings.h"
 #include "media/base/media.h"
 #include "media/base/media_switches.h"
 #include "mojo/edk/embedder/embedder.h"
 
 #if defined(OS_ANDROID)
@@ skipping 32 matching lines @@
 
   if (media::MediaCodecUtil::IsMediaCodecAvailable())
     media::EnablePlatformDecoderSupport();
 #endif
 
   // Run this here instead of main() to ensure an AtExitManager is already
   // present.
   media::InitializeMediaLibrary();
   media::SetUpFakeLocalizedStrings();
 
+  base::TaskScheduler::CreateAndSetSimpleTaskScheduler(1);

[gab, 2017/02/23 21:37:10]

base::test::ScopedTaskScheduler (we typically prefer to only put it in fixtures
that need it but if all your tests need it it's your call if you want it here)

   base::DiscardableMemoryAllocator::SetInstance(&discardable_memory_allocator_);
 }
 
 int main(int argc, char** argv) {
   mojo::edk::Init();
   TestSuiteNoAtExit test_suite(argc, argv);
 
   return base::LaunchUnitTests(
       argc, argv,
       base::Bind(&TestSuiteNoAtExit::Run, base::Unretained(&test_suite)));
 }