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

include/gpu/GrClip.h

Index: include/gpu/GrClip.h
diff --git a/include/gpu/GrClip.h b/include/gpu/GrClip.h
index ce0f155e2fd49617c3f7259a8ded577b3b1c9025..26aab7005b1fdc8c766010edcde4e16eeedc32ff 100644
--- a/include/gpu/GrClip.h
+++ b/include/gpu/GrClip.h
@@ -46,6 +46,12 @@ public:
         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);