Remove interpolants are inaccurate workaround for Adreno 3xx.

The chrome screenshot unit test that led to adding this workaround has
been adjusted to avoid testing AA edges of rendered rectangles. We're
accepting the inaccuracy in favor of increased performance.

Chrome change: https://chromium-review.googlesource.com/c/chromium/src/+/1129041

Bug: chromium:847984
Change-Id: I9b714ade2a67e956ebb2773ebe3b8632dc3a50c6
Reviewed-on: https://skia-review.googlesource.com/140180
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
4 files changed