RFR: 8236651: Simplify and update glass gtk backend

Fri Jun 12 12:51:51 UTC 2020

On Fri, 12 Jun 2020 11:55:47 GMT, Pankaj Bansal <pbansal at openjdk.org> wrote:

>> I have run the test on OL82 on updated code. Following are the results. I will rerun this on Ubuntu 18.04 and get back
>> with the results <img width="647" alt="OL82"
>> src="https://user-images.githubusercontent.com/6153953/84469824-918dfa80-ac9f-11ea-9494-36208798312a.png">
>
> I ran the systemTests on OL8.2 using
> gradle -PEXTRA_TEST_ARGS='-Djavafx.gtk.experimental=true' -PFULL_TEST=true -PUSE_ROBOT=true :systemTests:cleanTest
> :systemTests:test. Following are the results  <img width="578" alt="OL82"
> src="https://user-images.githubusercontent.com/6153953/84500229-bdc26f00-acd1-11ea-8d69-2ac3812db636.png">

After the latest commit on June 10, this is not building for me on my Ubuntu 18.04. I am attaching the build log for
reference. [build.log](https://github.com/openjdk/jfx/files/4770864/build.log)

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