performance increase by not drawing on do nothing frames

Change-Id: Ibcd4f0ed468563b22e29d23c7d72b474534d21f3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299916
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
1 file changed