RFR: JDK-8299977 : Update WebKit to 615.1

Sat Jan 28 14:22:30 UTC 2023

On Wed, 25 Jan 2023 19:51:02 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

> Update JavaFX WebKit to GTK WebKit 2.38 (615.1).
> 
> Verified the updated version build, sanity tests and stability.
> This does not cause any issues except one unit test failure.
> Also, there are some artifacts observed while playing youtube
> 
> The above issues are recorded and ignored using below bugs:
> [JDK-8300954](https://bugs.openjdk.org/browse/JDK-8300954)
> [JDK-8301022](https://bugs.openjdk.org/browse/JDK-8301022)

Looks good. I'll re-approve once you remove the comment and print statement from `ImageBufferBackend.h` that you mentioned in the description.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.org/jfx/pull/1011