Fix TSAN-detected data race: Sync with audio thread before accessing output_streams_ in unit test c…

media/audio/virtual_audio_input_stream_unittest.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 <list>
 
 #include "base/message_loop.h"
 #include "base/rand_util.h"
 #include "base/synchronization/waitable_event.h"
 #include "media/audio/audio_io.h"
@@ skipping 143 matching lines @@
   }
 
   void Close() {
     ASSERT_TRUE(!!stream_);
     stream_->Close();
     stream_ = NULL;
     closed_stream_.Signal();
   }
 
   void WaitForDataPulls() {
+    // Wait until audio thread is idle before calling output_streams_.size().
+    SyncWithAudioThread();
+
     const int count = output_streams_.size();
     for (int i = 0; i < count; ++i) {
       source_.WaitForDataPulls();
     }
   }
 
   void WaitForDataPushes() {
     input_callback_.WaitForDataPushes();
   }
 
@@ skipping 210 matching lines @@
   RUN_ON_AUDIO_THREAD(Stop);
   RUN_ON_AUDIO_THREAD(Close);
   WaitUntilClosed();
   WaitForDataPulls();
   for (int i = 0; i < kNumOutputs; ++i) {
     RUN_ON_AUDIO_THREAD(StopAndCloseOneOutputStream);
   }
 }
 
 }  // namespace media