RFR: 8272329: Cherry pick GTK WebKit 2.32.3 changes [v2]

[Ambarish Rapte]

On Mon, 16 Aug 2021 17:53:56 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> I think this change was lost during webkit update. and it caused a regression [JDK-8269067](https://bugs.openjdk.java.net/browse/JDK-8269067) : CSSFilterTest fails intermittently in Windows.
>> This change was originally included to enable CSSFilterTest.
>> Adding back this change sounds like a good idea to me.
>
> The original addition of this #ifdef was due to JDK-8260165. That commit introduced the problems I mentioned above (WebView took 250ms to update if not visible), so I don't think it is a good solution. 
> I suggest we discuss that in JDK-8269067 (but not include it in the PR with the cherry-pick of the changes, as it is not in the upstream webkit)?

I have reverted this change. The CSSFilterTest.testCSSFilterRendering is already ignored.

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PR: https://git.openjdk.java.net/jfx/pull/603