RFR: 8260165: CSSFilterTest.testCSSFilterRendering system test fails

[Guru Hb]

On Mon, 22 Feb 2021 11:55:00 GMT, Arun Joseph <ajoseph at openjdk.org> wrote:

> Issue: Initial layout delay was removed and layout() is called from layoutTimer instead of WebPage::prePaint().
> 
> Fix: Re-introduce the initial layout delay.

Tested on Linux and Windows, Looks good to me.

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Marked as reviewed by ghb (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/408