Add GrAASmallPathRenderer.

src/gpu/GrSWMaskHelper.h

Index: src/gpu/GrSWMaskHelper.h
diff --git a/src/gpu/GrSWMaskHelper.h b/src/gpu/GrSWMaskHelper.h
index f8cce8b27717f3d0af5163ff67b23873f5742c84..b23ee2c7c0b9e6bb70b8e8af05839fd353c0e392 100644
--- a/src/gpu/GrSWMaskHelper.h
+++ b/src/gpu/GrSWMaskHelper.h
@@ -68,13 +68,16 @@ public:
     // Move the mask generation results from the internal bitmap to the gpu.
     void toTexture(GrTexture* texture);
 
+    // Convert mask generation results to a signed distance field
+    void toSDF(unsigned char* sdf);
+    
     // Reset the internal bitmap
     void clear(uint8_t alpha) {
         fBM.eraseColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
     }
 
     // Canonical usage utility that draws a single path and uploads it
-    // to the GPU. The result is returned in "result".
+    // to the GPU. The result is returned.
     static GrTexture* DrawPathMaskToTexture(GrContext* context,
                                             const SkPath& path,
                                             const SkStrokeRec& stroke,