make SkiaSalGraphicsImpl use GPU-backed SkSurface also for offscreen

Skia's sk_app::WindowContext can create GPU-backed SkSurface only
for windows, but we also use virtual devices that are not windows.
Fortunately, SkSurface can be created GPU-backed from GrContext*
and sk_gpu_test::GrContextFactory seems to provide it easily.
It is not completely clear to me what the rules are on mixing
SkSurface's with different GrContext* (see the comment
in SkiaSalGraphicsImpl::copyBits()), but it seems to work fine.

Change-Id: I8110b67c41ab092e0c4b6a0973d6bed8a408c4c1

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