fix(animationFrame): req/cancel animationFrame has to be called within the context of root.

Author: trxcllnt

src/util/AnimationFrame.ts

@@ -5,22 +5,22 @@ export class RequestAnimationFrameDefinition {
   requestAnimationFrame: (cb: () => void) => number;
   constructor(root: any) {
     if (root.requestAnimationFrame) {
-      this.cancelAnimationFrame = root.cancelAnimationFrame;
-      this.requestAnimationFrame = root.requestAnimationFrame;
+      this.cancelAnimationFrame = root.cancelAnimationFrame.bind(root);
+      this.requestAnimationFrame = root.requestAnimationFrame.bind(root);
     } else if (root.mozRequestAnimationFrame) {
-      this.cancelAnimationFrame = root.mozCancelAnimationFrame;
-      this.requestAnimationFrame = root.mozRequestAnimationFrame;
+      this.cancelAnimationFrame = root.mozCancelAnimationFrame.bind(root);
+      this.requestAnimationFrame = root.mozRequestAnimationFrame.bind(root);
     } else if (root.webkitRequestAnimationFrame) {
-      this.cancelAnimationFrame = root.webkitCancelAnimationFrame;
-      this.requestAnimationFrame = root.webkitRequestAnimationFrame;
+      this.cancelAnimationFrame = root.webkitCancelAnimationFrame.bind(root);
+      this.requestAnimationFrame = root.webkitRequestAnimationFrame.bind(root);
     } else if (root.msRequestAnimationFrame) {
-      this.cancelAnimationFrame = root.msCancelAnimationFrame;
-      this.requestAnimationFrame = root.msRequestAnimationFrame;
+      this.cancelAnimationFrame = root.msCancelAnimationFrame.bind(root);
+      this.requestAnimationFrame = root.msRequestAnimationFrame.bind(root);
     } else if (root.oRequestAnimationFrame) {
-      this.cancelAnimationFrame = root.oCancelAnimationFrame;
-      this.requestAnimationFrame = root.oRequestAnimationFrame;
+      this.cancelAnimationFrame = root.oCancelAnimationFrame.bind(root);
+      this.requestAnimationFrame = root.oRequestAnimationFrame.bind(root);
     } else {
-      this.cancelAnimationFrame = root.clearTimeout;
+      this.cancelAnimationFrame = root.clearTimeout.bind(root);
       this.requestAnimationFrame = function(cb) { return root.setTimeout(cb, 1000 / 60); };
     }
   }