Fix the timestamp generation for webrtc native log.

chrome/renderer/media/chrome_webrtc_log_message_delegate.h

Index: chrome/renderer/media/chrome_webrtc_log_message_delegate.h
diff --git a/chrome/renderer/media/chrome_webrtc_log_message_delegate.h b/chrome/renderer/media/chrome_webrtc_log_message_delegate.h
index c3ecf52012f5a32cb423a72cc9618b74e9791421..a32d58075146062e7b78d2ae59409b4967dae605 100644
--- a/chrome/renderer/media/chrome_webrtc_log_message_delegate.h
+++ b/chrome/renderer/media/chrome_webrtc_log_message_delegate.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/memory/shared_memory.h"
+#include "chrome/renderer/media/webrtc_logging_message_filter.h"
 #include "content/public/renderer/webrtc_log_message_delegate.h"
 #include "ipc/ipc_channel_proxy.h"
 
@@ -17,6 +18,7 @@ class MessageLoopProxy;
 
 class PartialCircularBuffer;
 class WebRtcLoggingMessageFilter;
+struct WebRtcLoggingMessage;
 
 // ChromeWebRtcLogMessageDelegate handles WebRTC logging. There is one object
 // per render process, owned by WebRtcLoggingMessageFilter. It communicates with
@@ -41,12 +43,13 @@ class ChromeWebRtcLogMessageDelegate
   void OnStopLogging();
 
  private:
-  void LogMessageOnIOThread(const std::string& message);
+  void LogMessageOnIOThread(const WebRtcLoggingMessage& message);
   void SendLogBuffer();
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop_;
   bool logging_started_;
-  std::string log_buffer_;
+  std::vector<WebRtcLoggingMessage> log_buffer_;
+
   base::TimeTicks last_log_buffer_send_;
 
   WebRtcLoggingMessageFilter* message_filter_;