Save references to room and previewTracks

This makes debugging easier.

Author: markandrus

quickstart/src/index.js

@@ -83,7 +83,7 @@ $.getJSON('/token', function(data) {
 
 // Successfully connected!
 function roomJoined(room) {
-  activeRoom = room;
+  window.room = activeRoom = room;
 
   log("Joined as '" + identity + "'");
   document.getElementById('button-join').style.display = 'none';
@@ -145,7 +145,7 @@ document.getElementById('button-preview').onclick = function() {
     : Video.createLocalTracks();
 
   localTracksPromise.then(function(tracks) {
-    previewTracks = tracks;
+    window.previewTracks = previewTracks = tracks;
     var previewContainer = document.getElementById('local-media');
     if (!previewContainer.querySelector('video')) {
       attachTracks(tracks, previewContainer);