Fixed GPU perlin noise shaders under rotation.

Note that this does not fix perspective rendering, which it
turns out is broken under CPU also... so at least the behavior
is consistent between the two now.

Bug: skia:8250
Change-Id: I35187c9a9bcf403f61348a33ef1623afeec2e73e
Reviewed-on: https://skia-review.googlesource.com/c/182966
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed