RFR: 8294535 : Add screen capture functionality to PassFailJFrame

[Damon Nguyen]

On Thu, 25 May 2023 22:50:15 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> > > It saves the images to _the current directory_. When the test is run by jtreg, the current directory is the `scratch` directory.
> > 
> > 
> > For me, the generated screenshot was being saved to the test folder, as I was running it as standalone test.
> 
> Which is expected because you were running the test as a standalone test. Whatever the current directory is, the images are put in the current directory. The jtreg framework sets the current directory to `scratch`.

I think the mixup is similar to what I implemented for my test ([https://github.com/openjdk/jdk/pull/7310](https://github.com/openjdk/jdk/pull/7310)) when trying to save an image. I was initially advised to set a testDir path to save the image to. But it sounds like it's not needed here.

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PR Comment: https://git.openjdk.org/jdk/pull/14094#issuecomment-1564794192