AudioManagerBase: Create and run the audio thread lazily.

media/audio/audio_low_latency_input_output_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 <stddef.h>
 #include <stdint.h>
 
 #include "base/environment.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
@@ skipping 81 matching lines @@
 };
 
 // This class mocks the platform specific audio manager and overrides
 // the GetMessageLoop() method to ensure that we can run our tests on
 // the main thread instead of the audio thread.
 class MockAudioManager : public AudioManagerAnyPlatform {
  public:
   MockAudioManager() : AudioManagerAnyPlatform(&fake_audio_log_factory_) {}
   ~MockAudioManager() override {}
 
-  scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() const override {
+  scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() override {
     return base::MessageLoop::current()->task_runner();
   }
 
  private:
   FakeAudioLogFactory fake_audio_log_factory_;
   DISALLOW_COPY_AND_ASSIGN(MockAudioManager);
 };
 
 // Test fixture class.
 class AudioLowLatencyInputOutputTest : public testing::Test {
@@ skipping 320 matching lines @@
 
   // All Close() operations that run on the mocked audio thread,
   // should be synchronous and not post additional close tasks to
   // mocked the audio thread. Hence, there is no need to call
   // message_loop()->RunUntilIdle() after the Close() methods.
   aos->Close();
   ais->Close();
 }
 
 }  // namespace media