Make dummy device succeed at stopping recording/playout.

webrtc/modules/audio_device/dummy/audio_device_dummy.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 51 matching lines @@
 bool AudioDeviceDummy::PlayoutIsInitialized() const { return false; }
 
 int32_t AudioDeviceDummy::RecordingIsAvailable(bool& available) { return -1; }
 
 int32_t AudioDeviceDummy::InitRecording() { return -1; }
 
 bool AudioDeviceDummy::RecordingIsInitialized() const { return false; }
 
 int32_t AudioDeviceDummy::StartPlayout() { return -1; }
 
-int32_t AudioDeviceDummy::StopPlayout() { return -1; }
+int32_t AudioDeviceDummy::StopPlayout() { return 0; }
 
 bool AudioDeviceDummy::Playing() const { return false; }
 
 int32_t AudioDeviceDummy::StartRecording() { return -1; }
 
-int32_t AudioDeviceDummy::StopRecording() { return -1; }
+int32_t AudioDeviceDummy::StopRecording() { return 0; }
 
 bool AudioDeviceDummy::Recording() const { return false; }
 
 int32_t AudioDeviceDummy::SetAGC(bool enable) { return -1; }
 
 bool AudioDeviceDummy::AGC() const { return false; }
 
 int32_t AudioDeviceDummy::SetWaveOutVolume(uint16_t volumeLeft,
                                            uint16_t volumeRight) {
   return -1;
@@ skipping 119 matching lines @@
 void AudioDeviceDummy::ClearPlayoutWarning() {}
 
 void AudioDeviceDummy::ClearPlayoutError() {}
 
 void AudioDeviceDummy::ClearRecordingWarning() {}
 
 void AudioDeviceDummy::ClearRecordingError() {}
 
 void AudioDeviceDummy::AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) {}
 }  // namespace webrtc