UMA log for audio_device Init and Start(Playout|Recording). Make Init return a more specific error …

webrtc/modules/audio_device/dummy/audio_device_dummy.h

 /*
  *  Copyright (c) 2012 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.
  */
 
 #ifndef WEBRTC_AUDIO_DEVICE_AUDIO_DEVICE_DUMMY_H
 #define WEBRTC_AUDIO_DEVICE_AUDIO_DEVICE_DUMMY_H
 
 #include <stdio.h>
 
 #include "webrtc/modules/audio_device/audio_device_generic.h"
 
 namespace webrtc {
 
 class AudioDeviceDummy : public AudioDeviceGeneric {
  public:
   AudioDeviceDummy(const int32_t id) {}
   virtual ~AudioDeviceDummy() {}
 
   // Retrieve the currently utilized audio layer
   int32_t ActiveAudioLayer(
       AudioDeviceModule::AudioLayer& audioLayer) const override;
 
   // Main initializaton and termination
-  int32_t Init() override;
+  InitStatus Init() override;
   int32_t Terminate() override;
   bool Initialized() const override;
 
   // Device enumeration
   int16_t PlayoutDevices() override;
   int16_t RecordingDevices() override;
   int32_t PlayoutDeviceName(uint16_t index,
                             char name[kAdmMaxDeviceNameSize],
                             char guid[kAdmMaxGuidSize]) override;
   int32_t RecordingDeviceName(uint16_t index,
@@ skipping 97 matching lines @@
   void ClearPlayoutError() override;
   void ClearRecordingWarning() override;
   void ClearRecordingError() override;
 
   void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) override;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_AUDIO_DEVICE_AUDIO_DEVICE_DUMMY_H