Add GM that directly tests GrRRectEffect and add inverse fill version of effect.

BUG=skia:
R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/176843016

git-svn-id: http://skia.googlecode.com/svn/trunk@13653 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed