CB-7690 InAppBrowser loadstart/loadstop events issues

Subscribing to events before navigating

www/inappbrowser.js

@@ -77,7 +77,7 @@ InAppBrowser.prototype = {
     }
 };
 
-module.exports = function(strUrl, strWindowName, strWindowFeatures) {
+module.exports = function(strUrl, strWindowName, strWindowFeatures, callbacks) {
     // Don't catch calls that write to existing frames (e.g. named iframes).
     if (window.frames && window.frames[strWindowName]) {
         var origOpenFunc = modulemapper.getOriginalSymbol(window, 'open');
@@ -86,6 +86,12 @@ module.exports = function(strUrl, strWindowName, strWindowFeatures) {
 
     strUrl = urlutil.makeAbsolute(strUrl);
     var iab = new InAppBrowser();
+
+    callbacks = callbacks || {};
+    for (var callbackName in callbacks) {
+        iab.addEventListener(callbackName, callbacks[callbackName]);
+    }
+
     var cb = function(eventname) {
        iab._eventHandler(eventname);
     };