Fix the timestamp generation for webrtc native log.

chrome/browser/media/webrtc_logging_handler_host.h

Index: chrome/browser/media/webrtc_logging_handler_host.h
diff --git a/chrome/browser/media/webrtc_logging_handler_host.h b/chrome/browser/media/webrtc_logging_handler_host.h
index 864498637cb45797ed949e77cfe6270dfaf6569b..1c505ad09fb566158ceabc49bfa9c58ac9e75e43 100644
--- a/chrome/browser/media/webrtc_logging_handler_host.h
+++ b/chrome/browser/media/webrtc_logging_handler_host.h
@@ -7,6 +7,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/shared_memory.h"
+#include "chrome/common/media/webrtc_logging_messages.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "net/base/net_util.h"
 
@@ -104,11 +105,12 @@ class WebRtcLoggingHandlerHost : public content::BrowserMessageFilter {
                                  bool* message_was_ok) OVERRIDE;
 
   // Handles log message requests from renderer process.
-  void OnAddLogMessage(const std::string& message);
+  void OnAddLogMessages(const std::vector<WebRtcLoggingMessage>& messages);
   void OnLoggingStoppedInRenderer();
 
   // Handles log message requests from browser process.
-  void AddLogMessageFromBrowser(const std::string& message);
+  void AddLogMessageFromBrowser(uint64 timestamp_ms,
+                                const std::string& message);
 
   void StartLoggingIfAllowed();
   void DoStartLogging();
@@ -129,6 +131,9 @@ class WebRtcLoggingHandlerHost : public content::BrowserMessageFilter {
                                bool success,
                                const std::string& error_message);
 
+  std::string FormatMessageWithTimestamp(uint64 msg_created_time_ms,
+                                         const std::string& message);
+
   scoped_ptr<unsigned char[]> log_buffer_;
   scoped_ptr<PartialCircularBuffer> circular_buffer_;
 
@@ -159,6 +164,10 @@ class WebRtcLoggingHandlerHost : public content::BrowserMessageFilter {
   // It's only accessed on the IO thread.
   base::SharedMemoryHandle foreign_memory_handle_;
 
+  // The system time in ms when logging is started. Reset when logging_state_
+  // changes to STOPPED.
+  uint64 logging_started_time_ms_;
+
   DISALLOW_COPY_AND_ASSIGN(WebRtcLoggingHandlerHost);
 };