Replace FFmpegDemuxer thread per element with base::TaskScheduler.

media/filters/ffmpeg_demuxer_unittest.cc

Index: media/filters/ffmpeg_demuxer_unittest.cc
diff --git a/media/filters/ffmpeg_demuxer_unittest.cc b/media/filters/ffmpeg_demuxer_unittest.cc
index 11bcbb3a72d318ba05f5bf0243dbb7252070805f..44b72e3e5d7d752c55e42cf173cb0c4853fc670d 100644
--- a/media/filters/ffmpeg_demuxer_unittest.cc
+++ b/media/filters/ffmpeg_demuxer_unittest.cc
@@ -18,6 +18,7 @@
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/mock_callback.h"
+#include "base/test/scoped_task_scheduler.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/base/decrypt_config.h"
@@ -80,7 +81,7 @@ static void EosOnReadDone(bool* got_eos_buffer,
 // FFmpeg, pipeline and filter host mocks.
 class FFmpegDemuxerTest : public testing::Test {
  protected:
-  FFmpegDemuxerTest() {}
+  FFmpegDemuxerTest() : task_scheduler_(&message_loop_) {}
 
   virtual ~FFmpegDemuxerTest() {
     if (demuxer_)
@@ -239,11 +240,13 @@ class FFmpegDemuxerTest : public testing::Test {
   }
 
   // Fixture members.
+
+  base::MessageLoop message_loop_;

[gab, 2017/02/24 01:09:05]

Drop this member (ScopedTaskScheduler will provide an implicit one).

We're trying to get rid of explicit MessageLoop usage.

Replace message_loop_.task_runner() with ThreadTaskRunnerHandle::Get().

[DaleCurtis, 2017/02/24 23:40:29]

Done.

+  base::test::ScopedTaskScheduler task_scheduler_;
   std::unique_ptr<FileDataSource> data_source_;
   std::unique_ptr<FFmpegDemuxer> demuxer_;
   StrictMock<MockDemuxerHost> host_;
   std::unique_ptr<MediaTracks> media_tracks_;
-  base::MessageLoop message_loop_;
 
   AVFormatContext* format_context() {
     return demuxer_->glue_->format_context();