Implement caching in the tessellating path renderer, including strokes.

src/gpu/GrBlurUtils.cpp

Index: src/gpu/GrBlurUtils.cpp
diff --git a/src/gpu/GrBlurUtils.cpp b/src/gpu/GrBlurUtils.cpp
index 6013b58bcfdef0bed0ac3070d53bdce5564d0d03..5671ebc128fef175fe12b844e8a5f6bc2825cb0f 100644
--- a/src/gpu/GrBlurUtils.cpp
+++ b/src/gpu/GrBlurUtils.cpp
@@ -156,6 +156,7 @@ void GrBlurUtils::drawPathWithMaskFilter(GrContext* context,
     SkASSERT(!pathIsMutable || origSrcPath.isVolatile());
 
     GrStrokeInfo strokeInfo(paint);
+    GrStrokeInfo origStrokeInfo(strokeInfo);
 
     // If we have a prematrix, apply it to the path, optimizing for the case
     // where the original path can in fact be modified in place (even though
@@ -290,6 +291,6 @@ void GrBlurUtils::drawPathWithMaskFilter(GrContext* context,
         return;
     }
 
-    drawContext->drawPath(renderTarget, clip, grPaint, viewMatrix, *pathPtr, strokeInfo);
+    drawContext->drawPath(renderTarget, clip, grPaint, viewMatrix, *pathPtr, strokeInfo, &origSrcPath, &origStrokeInfo);
 }