[Chromecast] Ignore MonitorLoop if EOS in unit test

chromecast/media/cma/backend/audio_video_pipeline_device_unittest.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.
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 358 matching lines @@
       return;
 
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&AudioVideoPipelineDeviceTest::FeedVideoBuffer,
                    base::Unretained(this)));
   }
 }
 
 void AudioVideoPipelineDeviceTest::MonitorLoop() {
+  // Backend is stopped, no need to monitor the loop any more.
+  if (audio_decoder_ == nullptr && video_decoder_ == nullptr)
+    return;
+
   base::TimeDelta media_time =
       base::TimeDelta::FromMicroseconds(backend_->GetCurrentPts());
 
   if (!pause_pattern_.empty() &&
       pause_pattern_[pause_pattern_idx_].delay >= base::TimeDelta() &&
       media_time >= pause_time_ + pause_pattern_[pause_pattern_idx_].delay) {
     // Do Pause
     backend_->Pause();
     pause_time_ = base::TimeDelta::FromMicroseconds(backend_->GetCurrentPts());
 
@@ skipping 95 matching lines @@
 TEST_F(AudioVideoPipelineDeviceTest, WebmPlayback) {
   scoped_ptr<base::MessageLoop> message_loop(new base::MessageLoop());
 
   ConfigureForFile("bear-640x360.webm");
   Start();
   message_loop->Run();
 }
 
 }  // namespace media
 }  // namespace chromecast