Disable coverage counting by default

Bug: skia:
Change-Id: Iacb4cb3e409c6abdd25319ec0884ef673fb04cec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201101
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
9 files changed