Log audio system used to WebRTC log.

media/audio/win/audio_manager_win.cc

Index: media/audio/win/audio_manager_win.cc
diff --git a/media/audio/win/audio_manager_win.cc b/media/audio/win/audio_manager_win.cc
index 89e9eab41d51cb260ae8dfecf65263fed14e7cc0..30ae3a8de8c32b4b3ab02411b46d27f774828bf6 100644
--- a/media/audio/win/audio_manager_win.cc
+++ b/media/audio/win/audio_manager_win.cc
@@ -67,6 +67,10 @@ static const int kNumInputBuffers = 3;
 // determined from the system
 static const int kFallbackBufferSize = 2048;
 
+namespace {
+const char kAudioManagerName[] = "Windows";
+}
+
 static int GetVersionPartAsInt(DWORDLONG num) {
   return static_cast<int>(num & 0xffff);
 }
@@ -331,6 +335,10 @@ std::string AudioManagerWin::GetAssociatedOutputDeviceID(
   return CoreAudioUtil::GetMatchingOutputDeviceID(input_device_id);
 }
 
+const char* AudioManagerWin::GetName() {
+  return kAudioManagerName;
+}
+
 // Factory for the implementations of AudioOutputStream for AUDIO_PCM_LINEAR
 // mode.
 // - PCMWaveOutAudioOutputStream: Based on the waveOut API.