fixed improved perlin noise effect on ANGLE

Bug: skia:6772
Change-Id: Id674d7f20ccd32fb79005d66351b5c49c51b3c90
Reviewed-on: https://skia-review.googlesource.com/20224
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed