Adding counter calculation script

to be injected in nativefier command

counter.js

@@ -0,0 +1,31 @@
+function updateBadgeCount()
+{
+  var targetNodes = document.getElementsByClassName("navItemBadge");
+
+  var count = 0; 
+  for (var i = 0; i < targetNodes.length; ++i)
+  {
+    count += parseInt(targetNodes[i].innerHTML);
+  }
+  count /= 2; // because Google Voice has duplicate nodes for some reason
+
+  var newTitle = "Voice" + (count > 0 ? " (" + count + ")" : "");
+  if (document.title !== newTitle)
+  {
+    document.title = newTitle;
+  }
+}
+
+// Update the badge every 5 seconds
+setInterval(updateBadgeCount, 5000);
+
+// update the badge as user clicks in the app, because GV updates the title with selected item's phone number
+new MutationObserver(function(mutations) {
+  updateBadgeCount();
+}).observe(
+  document.querySelector('title'), {
+    subtree: true,
+    characterData: true,
+    childList: true
+  }
+);