fix($$RAFProvider): check for webkitCancelRequestAnimationFrame.

Android 4.3 only supports webkitCancelRequestAnimationFrame.

Closes angular#6526

Author: Traxmaxx

src/ng/raf.js

@@ -6,7 +6,8 @@ function $$RAFProvider(){ //rAF
                                 $window.webkitRequestAnimationFrame;
 
     var cancelAnimationFrame = $window.cancelAnimationFrame ||
-                               $window.webkitCancelAnimationFrame;
+                               $window.webkitCancelAnimationFrame ||
+                               $window.webkitCancelRequestAnimationFrame;
 
     var raf = function(fn) {
       var id = requestAnimationFrame(fn);
@@ -19,4 +20,4 @@ function $$RAFProvider(){ //rAF
 
     return raf;
   }];
-}
+}

test/ng/rafSpec.js

@@ -44,4 +44,29 @@ describe('$$rAF', function() {
       }
     }));
   });
+
+  describe('mobile', function() {
+    it('should provide a cancellation method for an older version of Android', function() {
+
+      //we need to create our own injector to work around the ngMock overrides
+      var injector = createInjector(['ng', function($provide) {
+        $provide.value('$window', {
+          webkitRequestAnimationFrame: jasmine.createSpy('$window.webkitRequestAnimationFrame'),
+          webkitCancelRequestAnimationFrame: jasmine.createSpy('$window.webkitCancelRequestAnimationFrame')
+        });
+      }]);
+
+      var $$rAF = injector.get('$$rAF');
+      var $window = injector.get('$window');
+      var cancel = $$rAF(function() {});
+
+      expect($$rAF.supported).toBe(true);
+
+      try {
+        cancel();
+      } catch(e) {}
+
+      expect($window.webkitCancelRequestAnimationFrame).toHaveBeenCalled();
+    });
+  });
 });