Substracts from ttfm the time that user waits while been asked for user permissions.

JitsiMeetJS.js

             }, USER_MEDIA_PERMISSION_PROMPT_TIMEOUT);
         }
 
+        if(!window.connectionTimes)
+            window.connectionTimes = {};
+        window.connectionTimes["obtainPermissions.start"] =
+            window.performance.now();
+
         return RTC.obtainAudioAndVideoPermissions(options || {})
             .then(function(tracks) {
                 promiseFulfilled = true;
 
+                window.connectionTimes["obtainPermissions.end"] =
+                    window.performance.now();
+
                 if(!RTC.options.disableAudioLevels)
                     for(var i = 0; i < tracks.length; i++) {
                         var track = tracks[i];
                     Statistics.sendGetUserMediaFailed(error);
                 }
 
+                window.connectionTimes["obtainPermissions.end"] =
+                    window.performance.now();
+
                 return Promise.reject(error);
             }.bind(this));
     },

modules/RTC/JitsiRemoteTrack.js

 
         var ttfm = now
             - (this.conference.getConnectionTimes()["session.initiate"]
-            - this.conference.getConnectionTimes()["muc.joined"]);
+                - this.conference.getConnectionTimes()["muc.joined"])
+            - (window.connectionTimes["obtainPermissions.end"]
+                - window.connectionTimes["obtainPermissions.start"]);
         this.conference.getConnectionTimes()[type + ".ttfm"] = ttfm;
         console.log("(TIME) TTFM " + type + ":\t", ttfm);
         var eventName = type +'.ttfm';