HQ filtering for tiled/bleed drawBitmap

src/gpu/effects/GrBicubicEffect.h

Index: src/gpu/effects/GrBicubicEffect.h
diff --git a/src/gpu/effects/GrBicubicEffect.h b/src/gpu/effects/GrBicubicEffect.h
index eabc79fe56533a272a66d0a1cc39083255bb6df4..d8c431a4a16ce91fc2ba32536f4a60fe258793ce 100644
--- a/src/gpu/effects/GrBicubicEffect.h
+++ b/src/gpu/effects/GrBicubicEffect.h
@@ -17,6 +17,10 @@ class GrGLBicubicEffect;
 
 class GrBicubicEffect : public GrSingleTextureEffect {
 public:
+    enum {
+        kFilterTexelPad = 2, // Given a src rect in texels to be filtered, this number of
+                             // surrounding texels are needed by the kernel in x and y.
+    };
     virtual ~GrBicubicEffect();
 
     static const char* Name() { return "Bicubic"; }