Log audio system used to WebRTC log.

media/audio/fake_audio_manager.cc

Index: media/audio/fake_audio_manager.cc
diff --git a/media/audio/fake_audio_manager.cc b/media/audio/fake_audio_manager.cc
index 2915e7262908bf7bd2751a17ddb1774f5348ed5b..07e88a5b964c2d182451888d09ba2138049a62f8 100644
--- a/media/audio/fake_audio_manager.cc
+++ b/media/audio/fake_audio_manager.cc
@@ -34,6 +34,10 @@ bool FakeAudioManager::HasAudioOutputDevices() { return false; }
 
 bool FakeAudioManager::HasAudioInputDevices() { return false; }
 
+const char* FakeAudioManager::GetName() {
+  return "Fake";
+}
+
 // Implementation of AudioManagerBase.
 AudioOutputStream* FakeAudioManager::MakeLinearOutputStream(
     const AudioParameters& params,