Implement browser-side logging to WebRtc log

chrome/browser/media/webrtc_logging_handler_host.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_MEDIA_WEBRTC_LOGGING_HANDLER_HOST_H_
 #define CHROME_BROWSER_MEDIA_WEBRTC_LOGGING_HANDLER_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/memory/shared_memory.h"
 #include "content/public/browser/browser_message_filter.h"
@@ skipping 43 matching lines @@
   void UploadLog(const UploadDoneCallback& callback);
 
   // Called by WebRtcLogUploader when uploading has finished. Must be called on
   // the IO thread.
   void UploadLogDone();
 
   // Discards the log. May only be called after logging has stopped. Must be
   // called on the IO thread.
   void DiscardLog(const GenericDoneCallback& callback);
 
+  // Adds a message to the log. Must be called on the IO thread.
+  void LogMessage(const std::string& message);
+
   // May be called on any thread. |upload_log_on_render_close_| is used
   // for decision making and it's OK if it changes before the execution based
   // on that decision has finished.
   void set_upload_log_on_render_close(bool should_upload) {
     upload_log_on_render_close_ = should_upload;
   }
 
  private:
   // States used for protecting from function calls made at non-allowed points
   // in time. For example, StartLogging() is only allowed in CLOSED state.
@@ skipping 71 matching lines @@
 
   // This is the handle to be passed to the render process. It's stored so that
   // it doesn't have to be passed on when posting messages between threads.
   // It's only accessed on the IO thread.
   base::SharedMemoryHandle foreign_memory_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcLoggingHandlerHost);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_WEBRTC_LOGGING_HANDLER_HOST_H_