K 10
svn:author
V 6
jbeich
K 8
svn:date
V 27
2018-04-03T00:50:06.482025Z
K 7
svn:log
V 426
MFH: r466270

www/firefox: use SkiaGL by default for OpenGL/WebRender compositing

Copy OS X behavior. If OpenGL compositing[1] doesn't crash OS or browser
SkiaGL canvas rendering is unlikely to make it worse. Mainly improves
FishIE Tank benchmark.

[1] layers.acceleration.force-enabled -> true in about:config or
    $ env MOZ_ACCELERATED=1 firefox -new-instance -profile `mktemp -d` ...

Approved by:	ports-secteam blanket

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