[canvaskit] roll to v0.8.0

Biggest change here is to add initial support for WebGL 2.0 where possible.

Change-Id: I05657dbfeed25fc665205ceda6b35022f6a42053
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/249815
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2 files changed