Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/test_audio_thread.cc

Index: media/audio/test_audio_thread.cc
diff --git a/media/audio/test_audio_thread.cc b/media/audio/test_audio_thread.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3bffd9c08e7d7b9e916d8bb138aa26d3b8b75df4
--- /dev/null
+++ b/media/audio/test_audio_thread.cc
@@ -0,0 +1,47 @@
+// Copyright 2017 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 "media/audio/test_audio_thread.h"
+
+#include "base/run_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
+
+namespace media {
+
+TestAudioThread::TestAudioThread() : TestAudioThread(false) {}
+
+TestAudioThread::TestAudioThread(bool use_real_thread) {
+  if (use_real_thread) {
+    thread_ = base::MakeUnique<base::Thread>("AudioThread");
+#if defined(OS_WIN)
+    thread_->init_com_with_mta(true);
+#endif
+    CHECK(thread_->Start());
+    task_runner_ = thread_->task_runner();
+  } else {
+    task_runner_ = base::ThreadTaskRunnerHandle::Get();
+  }
+}
+
+TestAudioThread::~TestAudioThread() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+void TestAudioThread::Stop() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (thread_)
+    thread_->Stop();
+  else
+    base::RunLoop().RunUntilIdle();
+}
+
+base::SingleThreadTaskRunner* TestAudioThread::GetTaskRunner() {
+  return task_runner_.get();
+}
+
+base::SingleThreadTaskRunner* TestAudioThread::GetWorkerTaskRunner() {
+  return task_runner_.get();
+}
+
+}  // namespace media