Hardware accelerated off-screen rendering

[1zun4]

CEF supports hardware-accelerated off-screen rendering by enabling shared_texture_enabled via WindowInfo and passing --off-screen-rendering-enabled --shared-texture-enabled as arguments.

• https://bitbucket.org/chromiumembedded/cef/pull-requests/734
• https://github.com/chromiumembedded/cef/blob/2c411892e273c564dfb6650dcee8fea458849178/include/cef_render_handler.h#L151-L173.

Unfortunately, Java CEF lacks bindings for OnAcceleratedPaint, meaning we cannot make use of this feature.

[magreenblatt]

I added some related Mac commentary at #514 (comment)

[voidmaster000]

oh so this is the finale for javafx jcef after so many years? i cant wait for the mac thing and i want immediate access to this on windows. but im unsure how to take this fork/commit/issue, make it updated with current jcef repo commits if its behind and then use it (plus its not on jcefmaven but i think i will have to survive that).