Factor to treeshake better

lib/utils/async.html

@@ -73,24 +73,31 @@
       after(delay) {
         return  {
           run(fn) { return setTimeout(fn, delay); },
-          cancel: window.clearTimeout.bind(window)
+          cancel(handle) {
+            window.clearTimeout(handle);
+          }
         };
       },
       /**
        * Enqueues a function called in the next task.
        *
        * @memberof Polymer.Async.timeOut
        * @param {Function} fn Callback to run
+       * @param {number} delay Delay in milliseconds
        * @return {number} Handle used for canceling task
        */
-      run: window.setTimeout.bind(window),
+      run(fn, delay) {
+        return window.setTimeout(fn, delay);
+      },
       /**
        * Cancels a previously enqueued `timeOut` callback.
        *
        * @memberof Polymer.Async.timeOut
        * @param {number} handle Handle returned from `run` of callback to cancel
        */
-      cancel: window.clearTimeout.bind(window)
+      cancel(handle) {
+        window.clearTimeout(handle);
+      }
     },
 
     /**
@@ -108,14 +115,18 @@
        * @param {Function} fn Callback to run
        * @return {number} Handle used for canceling task
        */
-      run: window.requestAnimationFrame.bind(window),
+      run(fn) {
+        return window.requestAnimationFrame(fn);
+      },
       /**
        * Cancels a previously enqueued `animationFrame` callback.
        *
        * @memberof Polymer.Async.timeOut
        * @param {number} handle Handle returned from `run` of callback to cancel
        */
-      cancel: window.cancelAnimationFrame.bind(window)
+      cancel(handle) {
+        window.cancelAnimationFrame(handle);
+      }
     },
 
     /**