Forward output glitch information from stream WebRTC log

media/audio/audio_logging.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/logging.h"
+#include "media/audio/audio_logging.h"
+
+namespace media {
+
+WebRtcLoggingCallback g_webrtc_logging_callback = nullptr;
+
+// TODO: Make sure it's thread safe.

[o1ka, 2016/04/05 15:28:42]

You can use atomic flag to guard initialization.

+
+void InitWebRtcLoggingCallback(WebRtcLoggingCallback callback) {
+  CHECK(!g_webrtc_logging_callback);
+  g_webrtc_logging_callback = callback;
+}
+
+void WebRtcLogMessage(const std::string& message) {
+  if (g_webrtc_logging_callback)
+    g_webrtc_logging_callback(message);
+}
+
+}  //  namespace media