RFR: 8090547: Allow for transparent backgrounds in WebView

[Jose Pereda]

On Fri, 2 Jul 2021 11:01:56 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

> Currently, `WebPage` has already a public `setBackgroundColor()` method, but the class is not public. Therefore, public API is needed in `WebView` to allow developers access to it.
> 
> In line with the `fontSmoothingType` property, this PR provides public support for setting the background color of a WebPage, by adding a `pageFill` property, and a CSR is required.
> 
> The color for the background, that can be opaque, transparent or with any level of opacity, can be set via code or via CSS using `-fx-page-fill`.
> 
> Unit tests and a system test are provided.

CSR: https://bugs.openjdk.java.net/browse/JDK-8269848

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PR: https://git.openjdk.java.net/jfx/pull/563