Share one thread between all AudioOutputControllers instead of creating one per stream.

media/audio/win/audio_output_win_unittest.cc

 // Copyright (c) 2010 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 <windows.h>
 #include <mmsystem.h>
 
 #include "base/basictypes.h"
 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/sync_socket.h"
 #include "media/audio/audio_io.h"
+#include "media/audio/audio_manager.h"
 #include "media/audio/simple_sources.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::DoAll;
 using ::testing::InSequence;
 using ::testing::NiceMock;
 using ::testing::NotNull;
@@ skipping 679 matching lines @@
 
   oas->Start(&source);
 
   ::WaitForSingleObject(thread, INFINITE);
   ::CloseHandle(thread);
   delete sockets[1];
 
   oas->Stop();
   oas->Close();
 }