fix(RequestAnimationFrame): pass the timestamp to the callback

fixes #187

Author: vicb

lib/patch/functions.js

@@ -62,7 +62,7 @@ function patchRequestAnimationFrame(obj, fnNames) {
         var callZone = global.zone.isRootZone() ? global.zone.fork() : global.zone;
         if (fn) {
           arguments[0] = function () {
-            return callZone.run(fn, arguments);
+            return callZone.run(fn, this, arguments);
           };
         }
         return delegate.apply(obj, arguments);
@@ -81,9 +81,8 @@ function patchSetFunction(obj, fnNames) {
 
     if (delegate) {
       global.zone[name] = function (fn) {
-        var fnRef = fn;
         arguments[0] = function () {
-          return fnRef.apply(this, arguments);
+          return fn.apply(this, arguments);
         };
         var args = utils.bindArgumentsOnce(arguments);
         return delegate.apply(obj, args);

test/patch/requestAnimationFrame.spec.js

@@ -26,9 +26,16 @@ describe('requestAnimationFrame', function () {
       it('should bind to same zone when called recursively', function (done) {
         testZone.run(function () {
           var frames = 0;
+          var previousTimeStamp = 0;
+
+          function frameCallback(timestamp) {
+            expect(zone).toBe(testZone);
+
+            expect(timestamp).toMatch(/^[\d.]+$/);
+            // expect previous <= current
+            expect(previousTimeStamp).not.toBeGreaterThan(timestamp);
+            previousTimeStamp = timestamp;
 
-          function frameCallback() {
-            expect(zone === testZone).toBe(true);
             if (frames++ > 15) {
               return done();
             }