[PATCH] gnu: icecat: Add skia support.

[Julien Lepiller]

Hi,

Here are three patches to add skia, a graphics library and add support
for it in icecat. It is not made the default graphics engine, so to
enable it, you need to go in about:config and change
`gfx.content.azure.backends' and `gfx.canvas.azure.backends' to `skia'
instead of cairo. Doing this seems to solve the random crashes.

0001-gnu-Add-google-gn.patch
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0002-gnu-Add-skia.patch
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0003-gnu-icecat-Add-skia-support.patch
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