Log audio system used to WebRTC log.

media/audio/cras/audio_manager_cras.cc

Index: media/audio/cras/audio_manager_cras.cc
diff --git a/media/audio/cras/audio_manager_cras.cc b/media/audio/cras/audio_manager_cras.cc
index 6df14bc87191ff8ac16eed8ed3482fca43d53ada..5ce6058ec2ebf76c7e57e6ff815921de074533f5 100644
--- a/media/audio/cras/audio_manager_cras.cc
+++ b/media/audio/cras/audio_manager_cras.cc
@@ -49,6 +49,8 @@ const int kDefaultInputBufferSize = 1024;
 const char kBeamformingOnDeviceId[] = "default-beamforming-on";
 const char kBeamformingOffDeviceId[] = "default-beamforming-off";
 
+const char kAudioManagerName[] = "CRAS";
+
 enum CrosBeamformingDeviceState {
   BEAMFORMING_DEFAULT_ENABLED = 0,
   BEAMFORMING_USER_ENABLED,
@@ -228,6 +230,10 @@ AudioParameters AudioManagerCras::GetInputStreamParameters(
   return params;
 }
 
+const char* AudioManagerCras::GetName() {
+  return kAudioManagerName;
+}
+
 AudioOutputStream* AudioManagerCras::MakeLinearOutputStream(
     const AudioParameters& params,
     const LogCallback& log_callback) {