Backport some tests in /media/audio to SingleThreadTaskEnvironment

These tests were previously migrated from single-threaded MessageLoop to
a multi-threaded TaskEnvironment (then named ScopedTaskEnvironment) as
part of crbug.com/891670.

//base OWNERS decided in retrospect that it was better to keep a
single-threaded option for TaskEnvironment and introduced
SingleThreadTaskEnvironment. This CL retrofits that decision for
/media/audio.

This CL is a no-op if it passes CQ.

This CL was uploaded by git cl split.

R=tommi@chromium.org

Bug: 891670
Change-Id: I9bff22af41a71e1fd0483d76412748a38433da6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787199
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Commit-Queue: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693603}

media/audio/audio_input_controller_unittest.cc

@@ -144,7 +144,7 @@ class AudioInputControllerTest : public testing::TestWithParam<bool> {
     run_loop.Run();
   }
 
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
 
   // Parameterize tests to run AudioInputController either on audio thread
   // (synchronously), or on a different thread (non-blocking).

media/audio/audio_output_proxy_unittest.cc

@@ -488,7 +488,7 @@ class AudioOutputProxyTest : public testing::Test {
     proxy->Close();
   }
 
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   MockAudioManager manager_;
   std::unique_ptr<AudioOutputDispatcherImpl> dispatcher_impl_;
   MockAudioSourceCallback callback_;

media/audio/audio_system_impl_unittest.cc

@@ -36,7 +36,7 @@ class AudioSystemImplTestBase : public testing::Test {
   MockAudioManager* audio_manager() { return audio_manager_.get(); }
   AudioSystem* audio_system() { return audio_system_.get(); }
 
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   std::unique_ptr<MockAudioManager> audio_manager_;
   std::unique_ptr<AudioSystem> audio_system_;
   // AudioSystemTester tester_;

media/audio/mac/audio_device_listener_mac_unittest.cc

@@ -98,7 +98,7 @@ class AudioDeviceListenerMacTest : public testing::Test {
   MOCK_METHOD0(OnDeviceChange, void());
 
  protected:
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   std::unique_ptr<AudioDeviceListenerMac> device_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDeviceListenerMacTest);

media/audio/mac/audio_low_latency_input_mac_unittest.cc

@@ -113,7 +113,8 @@ class WriteToFileAudioSink : public AudioInputStream::AudioInputCallback {
 class MacAudioInputTest : public testing::Test {
  protected:
   MacAudioInputTest()
-      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI),
+      : task_environment_(
+            base::test::SingleThreadTaskEnvironment::MainThreadType::UI),
         audio_manager_(AudioManager::CreateForTesting(
             std::make_unique<TestAudioThread>())) {
     // Wait for the AudioManager to finish any initialization on the audio loop.
@@ -158,7 +159,7 @@ class MacAudioInputTest : public testing::Test {
 
   void OnLogMessage(const std::string& message) { log_message_ = message; }
 
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   std::unique_ptr<AudioManager> audio_manager_;
   std::string log_message_;
 };

media/audio/win/audio_low_latency_input_win_unittest.cc

@@ -268,7 +268,7 @@ class WinAudioInputTest : public ::testing::Test {
   ~WinAudioInputTest() override { audio_manager_->Shutdown(); }
 
  protected:
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   std::unique_ptr<AudioManager> audio_manager_;
 };
 

media/audio/win/audio_output_win_unittest.cc

@@ -164,7 +164,7 @@ class WinAudioTest : public ::testing::Test {
   ~WinAudioTest() override { audio_manager_->Shutdown(); }
 
  protected:
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   std::unique_ptr<AudioManager> audio_manager_;
   std::unique_ptr<AudioDeviceInfoAccessorForTests> audio_manager_device_info_;
 };