RFR: 8306072: Open source several AWT MouseInfo related tests [v3]

[lawrence.andrews]

On Mon, 24 Apr 2023 15:36:34 GMT, lawrence.andrews <duke at openjdk.org> wrote:

>> @lawrence-andrew, BTW, why `transient`? Should it be `volatile` instead?
>
> Oh, yes, sorry I was meant to say volatile but I typed transient. Sorry for the confusion.

Looks good to me.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13573#discussion_r1175538318