Support Blink 'touch-action-delay' property

- Will remove 300ms click delay
- Disables `touchevent.preventDefault()`, should enable compositing scrolling
- Result of discussions at BlinkON:
  https://docs.google.com/a/google.com/presentation/d/1J1jG0XF6k42PA4s-otHFXZxrou7aKwYKYF90xPOe9bQ/edit#slide=id.g1076b4fe2_085

src/touch-action.js

@@ -1,9 +1,14 @@
+/*
+ * Copyright 2013 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 (function() {
   function selector(v) {
     return '[touch-action="' + v + '"]';
   }
   function rule(v) {
-    return '{ -ms-touch-action: ' + v + '; touch-action: ' + v + '; }';
+    return '{ -ms-touch-action: ' + v + '; touch-action: ' + v + '; touch-action-delay: none; }';
   }
   var attrib2css = [
     'none',