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

media/audio/simple_sources_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 "base/logging.h"
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
+#include "media/audio/audio_manager.h"
 #include "media/audio/fake_audio_output_stream.h"
 #include "media/audio/simple_sources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 void GenerateRandomData(char* buffer, uint32 len) {
   static bool called = false;
   if (!called) {
     called = true;
@@ skipping 79 matching lines @@
   EXPECT_EQ(0, last_buffer[0]);
   EXPECT_EQ(5126, last_buffer[1]);
   EXPECT_TRUE(last_buffer[1] < last_buffer[2]);
   EXPECT_TRUE(last_buffer[2] < last_buffer[3]);
   // Spot test negative incursion of sine wave.
   EXPECT_EQ(0, last_buffer[half_period]);
   EXPECT_EQ(-5126, last_buffer[half_period + 1]);
   EXPECT_TRUE(last_buffer[half_period + 1] > last_buffer[half_period + 2]);
   EXPECT_TRUE(last_buffer[half_period + 2] > last_buffer[half_period + 3]);
 }