DCHECK that audio devices are stopped prior to destruction.

media/audio/audio_input_device_unittest.cc

 // Copyright (c) 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 "base/memory/ptr_util.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/process/process_handle.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 75 matching lines @@
   MockAudioInputIPC* input_ipc = new MockAudioInputIPC();
   scoped_refptr<AudioInputDevice> device(
       new AudioInputDevice(base::WrapUnique(input_ipc), io_loop.task_runner()));
   device->Initialize(params, &callback, 1);
   device->Start();
   EXPECT_CALL(*input_ipc, CreateStream(_, _, _, _, _))
       .WillOnce(ReportStateChange(device.get()));
   EXPECT_CALL(callback, OnCaptureError(_))
       .WillOnce(QuitLoop(io_loop.task_runner()));
   base::RunLoop().Run();
+  device->Stop();
+  base::RunLoop().RunUntilIdle();
 }
 
 ACTION_P5(ReportOnStreamCreated, device, handle, socket, length, segments) {
   static_cast<AudioInputIPCDelegate*>(device)->OnStreamCreated(
       handle, socket, length, segments);
 }
 
 TEST(AudioInputDeviceTest, CreateStream) {
   AudioParameters params(AudioParameters::AUDIO_PCM_LOW_LATENCY,
                          CHANNEL_LAYOUT_STEREO, 48000, 16, 480);
@@ skipping 26 matching lines @@
 
   EXPECT_CALL(*input_ipc, CreateStream(_, _, _, _, _))
       .WillOnce(ReportOnStreamCreated(
           device.get(), duplicated_memory_handle,
           SyncSocket::UnwrapHandle(audio_device_socket_descriptor), memory_size,
           1));
   EXPECT_CALL(*input_ipc, RecordStream());
   EXPECT_CALL(callback, OnCaptureStarted())
       .WillOnce(QuitLoop(io_loop.task_runner()));
   base::RunLoop().Run();
+  device->Stop();
+  base::RunLoop().RunUntilIdle();
 }
+
 }  // namespace media.