Log audio system used to WebRTC log.

media/audio/android/audio_manager_android.cc

Index: media/audio/android/audio_manager_android.cc
diff --git a/media/audio/android/audio_manager_android.cc b/media/audio/android/audio_manager_android.cc
index 9f18d5d713ae76f6122bbe0ceaa8fb6a9b097344..502a8cbf8dc84955a99546cfabc3858b164e0e4e 100644
--- a/media/audio/android/audio_manager_android.cc
+++ b/media/audio/android/audio_manager_android.cc
@@ -161,6 +161,10 @@ AudioParameters AudioManagerAndroid::GetInputStreamParameters(
   return params;
 }
 
+const char* AudioManagerAndroid::GetName() {
+  return "Android";
+}
+
 AudioOutputStream* AudioManagerAndroid::MakeAudioOutputStream(
     const AudioParameters& params,
     const std::string& device_id,