I think WTF is patching addEventListener incorrectly

[mhevery]

It looks to me (and I was able to verify this in the debugger) is that the WTF is patching event HTMLElement separately. see:

tracing-framework/src/wtf/trace/providers/domprovider.js

Line 127 in edbae6e

wtf.trace.providers.DomProvider.prototype.injectElements_ = function() {

The proper way to patch addEventListener is on the EventTarget class rather than on the individual subclasses. Or better yet, we should walk the prototype chain of each object and only patch the API if hasOwnProperty('addEventListener') returns true.

This causes issues with Zone.js. DOM interception stops working when WTF is turned on because we incorrectly get patched on superclass.