Instrument props defined in window.document itself

[yuhao]

Right now, instrumenting a prop defined in window.document itself leads to infinite loop.

This is because we do the following: getterOfProp = Object.getOwnPropertyDescriptor(ownerOfProp, prop).get; and we eventually call originalGetter.apply(window.document);, which leads to an infinite loop.

For now, we just return without instrumenting it. Need to figure out a way to fix it. One workaround maybe to define the instrumented property in document.__proto__