feat(onProperty): fix #875, can disable patch specified onProperties

[JiaLiPassion]

fix #875.

can disable patch specified onProperties,for example,
if you want to disable window.onmessage and HTMLElement.prototype.onclick from zone.js patching,
you can do like this.

 <script>
    __Zone_ignore_on_properties = [
      {
        target: window,
        ignoreProperties: ['message']
      }, {
        target: HTMLElement.prototype,
        ignoreProperties: ['click']
      }
    ];
  </script>
  <script src="../dist/zone.js"></script>

[mhevery]

could we turn this into our own module so that it is consistent with the rest of the system?

[JiaLiPassion]

@mhevery , currently propertyDescriptorPatch is only be called from here, it is already in our module system.

Zone.__load_patch('on_property', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
  propertyDescriptorPatch(api, global);
  propertyPatch();
  registerElementPatch(global);
});

and the _global is also from our own module parameter.

[mhevery]

So what is the point of having this check?

[mhevery]

Ohh, now I understand. ... :-)