postMessage doesn't work :Android

# Bug Report
the event message do postMessage doesn't get the message. (in Android)

## Problem
I try the default version and version 2.0.2 and it's doesn't work.

I create new WebView (for example: google), with eventListener "message":

In the console of the new WebView i try to postMessage (with to way : [window.parent.postMessage , window.postMessage])

and i doesn't get the message in the first console .

Of course I tried too get the message with console.log...

thank's

No source file or test is named. Reproduce both postMessage calls in an Android InAppBrowser WebView, then trace the plugin's message-event handling; done means the receiving WebView logs the posted message on the affected versions and a regression test covers the behavior.

Written by the indexing model from the issue text.