RFR: 8272870: Add convenience factory methods for border and background [v4]

Tue Oct 5 17:40:11 UTC 2021

On Sun, 19 Sep 2021 01:40:11 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Added convenience factory factory methods for Background and Border.
>
> Nir Lisker has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added null tests and changed doc as per comments

Marked as reviewed by arapte (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/610