RFR: 8236651: Simplify and update glass gtk backend

[Tor (torbuntu)]

On Tue, 25 Aug 2020 14:12:14 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

> I would starting hooking gtk event signals (https://developer.gnome.org/gtk3/stable/GtkWidget.html), specially the
> "touch-event" to JavaFx events (probably need to add through JNI). Should be simple. Contact me at thiago.sayao (gmail).

Would it be safe you think to branch from your PR to have the updated gtk backend? It would be much easier to work with.

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PR: https://git.openjdk.java.net/jfx/pull/77