Don't scissor draws overlapping the render target's edges

include/gpu/GrClip.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrClip_DEFINED
 #define GrClip_DEFINED
 
@@ skipping 28 matching lines @@
         fScissorState.set(scissor);
         fHasStencilClip = hasStencil;
     }
 
     void makeFPBased(sk_sp<GrFragmentProcessor> fp) {
         fClipCoverageFP = fp;
         fScissorState.setDisabled();
         fHasStencilClip = false;
     }
 
+    void makeScissored(SkIRect& scissor) {
+        fClipCoverageFP.reset();
+        fScissorState.set(scissor);
+        fHasStencilClip = false;
+    }
+
     void makeScissoredFPBased(sk_sp<GrFragmentProcessor> fp, SkIRect& scissor) {
         fClipCoverageFP = fp;
         fScissorState.set(scissor);
         fHasStencilClip = false;
     }
 
 private:
     sk_sp<GrFragmentProcessor> fClipCoverageFP;
     GrScissorState             fScissorState;
     bool                       fHasStencilClip;
@@ skipping 87 matching lines @@
                                bool* isIntersectionOfRects) const final;
     bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*,
                const SkRect* devBounds, GrAppliedClip*) const final;
 
 private:
     SkIPoint                          fOrigin;
     SkAutoTUnref<const SkClipStack>   fStack;
 };
 
 #endif