DCHECK that audio devices are stopped prior to destruction.

media/audio/audio_input_device.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 "media/audio/audio_input_device.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 173 matching lines @@
       callback_->OnCaptureError("IPC delegate state error.");
   }
 }
 
 void AudioInputDevice::OnIPCClosed() {
   DCHECK(task_runner()->BelongsToCurrentThread());
   state_ = IPC_CLOSED;
   ipc_.reset();
 }
 
-AudioInputDevice::~AudioInputDevice() {}
+AudioInputDevice::~AudioInputDevice() {
+#if DCHECK_IS_ON()
+  // Make sure we've stopped the stream properly before destructing |this|.
+  DCHECK(audio_thread_lock_.Try());
+  DCHECK_LE(state_, IDLE);
+  DCHECK(!audio_thread_);
+  DCHECK(!audio_callback_);
+  DCHECK(!stopping_hack_);
+  audio_thread_lock_.Release();
+#endif  // DCHECK_IS_ON()
+}
 
 void AudioInputDevice::StartUpOnIOThread() {
   DCHECK(task_runner()->BelongsToCurrentThread());
 
   // Make sure we don't call Start() more than once.
   if (state_ != IDLE)
     return;
 
   if (session_id_ <= 0) {
     DLOG(WARNING) << "Invalid session id for the input stream " << session_id_;
@@ skipping 133 matching lines @@
   capture_callback_->Capture(
       audio_bus,
       buffer->params.hardware_delay_bytes / bytes_per_ms_,  // Delay in ms
       buffer->params.volume, buffer->params.key_pressed);
 
   if (++current_segment_id_ >= total_segments_)
     current_segment_id_ = 0;
 }
 
 }  // namespace media