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

talk/app/webrtc/peerconnectioninterface.h

Index: talk/app/webrtc/peerconnectioninterface.h
diff --git a/talk/app/webrtc/peerconnectioninterface.h b/talk/app/webrtc/peerconnectioninterface.h
index ca853385e6327fdcad52014b32abc115685e80c1..5d489a2ca21b4a22d5915f03ccd35d6cf1e0b667 100644
--- a/talk/app/webrtc/peerconnectioninterface.h
+++ b/talk/app/webrtc/peerconnectioninterface.h
@@ -580,6 +580,16 @@ class PeerConnectionFactoryInterface : public rtc::RefCountInterface {
   // http://crbug.com/264611.
   virtual bool StartAecDump(rtc::PlatformFile file) = 0;
 
+  // Starts RtcEventLog using existing file. Takes ownership of |file| and
+  // passes it on to VoiceEngine, which will take the ownership. If the
+  // operation fails the file will be closed. The logging will stop
+  // automatically after 10 minutes have passed, or when the StopRtcEventLog
+  // function is called.
+  virtual bool StartRtcEventLog(rtc::PlatformFile file) = 0;
+
+  // Stops logging the RtcEventLog.
+  virtual void StopRtcEventLog() = 0;
+
  protected:
   // Dtor and ctor protected as objects shouldn't be created or deleted via
   // this interface.