RFR: 8369306: Implement invokeAndWait and finishTerminating on headless platform [v3]

[Andy Goryachev]

On Fri, 10 Oct 2025 12:56:02 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> This PR implements `invokeAndWait` and `finishTerminating` for the headless platform and includes two system tests, one for each, that fail before this PR, and pass after it.
>
> Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Process feedback from reviewer

modules/javafx.graphics/src/main/java/com/sun/glass/ui/headless/NestedRunnableProcessor.java line 66:

> 64:     void stopProcessing() {
> 65:         for (RunLoopEntry entry : activeRunLoops) {
> 66:             runnableQueue.add(() -> entry.active = false);

I would highly recommend declaring `RunLoopEntry.active` `volatile`.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1934#discussion_r2420628403