Replace FFmpegDemuxer thread per element with base::TaskScheduler.

media/test/pipeline_integration_test.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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
@@ skipping 1750 matching lines @@
   // but the numerator will be truncated in the TOC as 250, losing precision.
   base::TimeDelta seek_time(0.98 * pipeline_->GetMediaDuration());
 
   ASSERT_TRUE(Seek(seek_time));
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
 
   EXPECT_HASH_EQ(config.hash, GetAudioHash());
 }
 
-// TODO(CHCUNNINGHAM): Re-enable for OSX once 1% flakiness is root caused.
-// See http://crbug.com/571898
-#if !defined(OS_MACOSX)
 // CBR seeks should always be fast and accurate.
 INSTANTIATE_TEST_CASE_P(
     CBRSeek_HasTOC,
     Mp3FastSeekIntegrationTest,
     ::testing::Values(Mp3FastSeekParams("bear-audio-10s-CBR-has-TOC.mp3",
-                                        "-0.71,0.36,2.96,2.68,2.10,-1.08,")));
-#endif
+                                        "-0.71,0.36,2.96,2.68,2.11,-1.08,")));
 
 INSTANTIATE_TEST_CASE_P(
     CBRSeeks_NoTOC,
     Mp3FastSeekIntegrationTest,
     ::testing::Values(Mp3FastSeekParams("bear-audio-10s-CBR-no-TOC.mp3",
                                         "0.95,0.56,1.34,0.47,1.77,0.84,")));
 
 // VBR seeks can be fast *OR* accurate, but not both. We chose fast.
 INSTANTIATE_TEST_CASE_P(
     VBRSeeks_HasTOC,
@@ skipping 829 matching lines @@
 
 TEST_F(PipelineIntegrationTest, BasicPlaybackPositiveStartTime) {
   ASSERT_EQ(PIPELINE_OK, Start("nonzero-start-time.webm"));
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
   ASSERT_EQ(base::TimeDelta::FromMicroseconds(396000),
             demuxer_->GetStartTime());
 }
 
 }  // namespace media