Improves stereo/mono audio support on Android

webrtc/modules/audio_device/audio_device_buffer.cc

Index: webrtc/modules/audio_device/audio_device_buffer.cc
diff --git a/webrtc/modules/audio_device/audio_device_buffer.cc b/webrtc/modules/audio_device/audio_device_buffer.cc
index 79a0ebc3b69cbecb0a837b64e9f4495c0e7deaef..063c65f4fc120febd6da7db6fc800aaf23f4775f 100644
--- a/webrtc/modules/audio_device/audio_device_buffer.cc
+++ b/webrtc/modules/audio_device/audio_device_buffer.cc
@@ -376,8 +376,8 @@ int32_t AudioDeviceBuffer::RequestPlayoutData(size_t samples_per_channel) {
   }
   // Update playout stats which is used as base for periodic logging of the
   // audio output state.
-  UpdatePlayStats(max_abs, num_samples_out);
-  return static_cast<int32_t>(num_samples_out);
+  UpdatePlayStats(max_abs, num_samples_out / play_channels_);
+  return static_cast<int32_t>(num_samples_out / play_channels_);
 }
 
 int32_t AudioDeviceBuffer::GetPlayoutData(void* audio_buffer) {