Added functions on libjingle API to start and stop the recording of an RtcEventLog.

webrtc/call/rtc_event_log.h

Index: webrtc/call/rtc_event_log.h
diff --git a/webrtc/call/rtc_event_log.h b/webrtc/call/rtc_event_log.h
index a4b7cadadb7c3970865380866cbf320805773175..57b523ff467b207a79e93e81a4e30cd82aa7b12e 100644
--- a/webrtc/call/rtc_event_log.h
+++ b/webrtc/call/rtc_event_log.h
@@ -11,6 +11,8 @@
 #ifndef WEBRTC_CALL_RTC_EVENT_LOG_H_
 #define WEBRTC_CALL_RTC_EVENT_LOG_H_
 
+#include <stdio.h>
+
 #include <string>
 
 #include "webrtc/base/scoped_ptr.h"
@@ -41,6 +43,11 @@ class RtcEventLog {
   // If the file cannot be opened, the RtcEventLog will not start logging.
   virtual void StartLogging(const std::string& file_name, int duration_ms) = 0;
 
+  // Starts logging indefinitely until the StopLogging() function is called.
+  // This function uses an already opened file pointer as input, and will return
+  // 0 on success.
+  virtual int StartLogging(FILE* log_file) = 0;
+
   virtual void StopLogging() = 0;
 
   // Logs configuration information for webrtc::VideoReceiveStream