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
diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index 90106fa..9b95d33 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -192,7 +192,7 @@
             }
         } else if (isAA && SkClipStack::Element::kRRect_Type == type && !rt->isMultisampled()) {
             const SkRRect& rrect = elements.tail()->getRRect();
-            effect.reset(GrRRectEffect::Create(rrect));
+            effect.reset(GrRRectEffect::Create(GrRRectEffect::kFillAA_EdgeType, rrect));
         } else if (isAA && SkClipStack::Element::kRect_Type == type && !rt->isMultisampled()) {
             // We only handle AA/non-MSAA rects here. Coverage effect AA isn't MSAA friendly and
             // non-AA rect clips are handled by the scissor.