Recommend the zone add option that disabled patch the readonly properties

[jinxiu3939]

I use the third-part js framework in angular, it is babylon, When I use it`s function to import the xml file through the XMLHttpRequest, I can not do anything callback with the response, because the zone patch the DONE attribute of the XMLHttpRequest that became a function.

In the babylon.js，there is a condition, if the condition is true, it should callback the response, howeaver, it is false.

The condition is below:

if (request.readyState === (XMLHttpRequest.DONE || 4)) { // do success callback }

I try to use '__Zone_ignore_on_properties' and '__Zone_disable_XHR' to config the zone donot patch the XMLHttpRequest module, howeaver it is not work in angular.

I think the problem is the DONE attribute patch of zone in XMLHttpRequest is conflict with other framework. Other attributes is also, for example, LOADING, OPENED.

Because these attribute are readonly, I can not reset the value.

So I recommend the zone should disable patch for readonly properties in the next version.