CCPR: Check for flat lines before crunching on curves

Bug: skia:
Change-Id: Ib99f3f83aee4c261ef1cfc4e1045b2be3113e1ae
Reviewed-on: https://skia-review.googlesource.com/43100
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed