refactor(clientsidescripts): use the testability api if available

Getting ready for version of Angular which will include the testability API.

lib/clientsidescripts.js

@@ -28,8 +28,12 @@ var functions = {};
 functions.waitForAngular = function(selector, callback) {
   var el = document.querySelector(selector);
   try {
-    angular.element(el).injector().get('$browser').
-        notifyWhenNoOutstandingRequests(callback);
+    if (angular.getTestability) {
+      angular.getTestability(el).whenStable(callback);
+    } else {
+      angular.element(el).injector().get('$browser').
+          notifyWhenNoOutstandingRequests(callback);
+    }
   } catch (e) {
     callback(e);
   }
@@ -46,6 +50,10 @@ functions.waitForAngular = function(selector, callback) {
  */
 functions.findBindings = function(binding, exactMatch, using) {
   using = using || document;
+  if (angular.getTestability) {
+    return angular.getTestability(using).
+        findBindings(using, binding, exactMatch);
+  }
   var bindings = using.getElementsByClassName('ng-binding');
   var matches = [];
   for (var i = 0; i < bindings.length; ++i) {
@@ -338,6 +346,10 @@ functions.findRepeaterColumn = function(repeater, binding, using) {
  */
 functions.findByModel = function(model, using) {
   using = using || document;
+  if (angular.getTestability) {
+    return angular.getTestability(using).
+        findModels(using, model);
+  }
   var prefixes = ['ng-', 'ng_', 'data-ng-', 'x-ng-', 'ng\\:'];
   for (var p = 0; p < prefixes.length; ++p) {
     var selector = '[' + prefixes[p] + 'model="' + model + '"]';
@@ -515,6 +527,10 @@ functions.allowAnimations = function(element, value) {
  */
 functions.getLocationAbsUrl = function(selector) {
   var el = document.querySelector(selector);
+  if (angular.getTestability) {
+    return angular.getTestability(el).
+        getLocation();
+  }
   return angular.element(el).injector().get('$location').absUrl();
 };
 
@@ -527,6 +543,10 @@ functions.getLocationAbsUrl = function(selector) {
  */
 functions.setLocation = function(selector, url) {
   var el = document.querySelector(selector);
+  if (angular.getTestability) {
+    return angular.getTestability(el).
+        setLocation(url);
+  }
   var $injector = angular.element(el).injector();
   var $location = $injector.get('$location');
   var $rootScope = $injector.get('$rootScope');