Implement caching in the tessellating path renderer, including strokes.

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 4d59b8cd9deaa5787c82529f5e2255207b0ae4d1..cac257360498253584cfa71d754546268e5fd35f 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -190,7 +190,9 @@ public:
                   const GrPaint&,
                   const SkMatrix& viewMatrix,
                   const SkPath&,
-                  const GrStrokeInfo&);
+                  const GrStrokeInfo&,
+                  const SkPath* origSrcPath = nullptr,
+                  const GrStrokeInfo* origStrokeInfo = nullptr);
 
     /**
      * Draws vertices with a paint.
@@ -255,7 +257,9 @@ private:
                           GrColor,
                           bool useAA,
                           const SkPath&,
-                          const GrStrokeInfo&);
+                          const GrStrokeInfo&,
+                          const SkPath* origSrcPath = nullptr,
+                          const GrStrokeInfo* origStrokeInfo = nullptr);
 
     // This entry point allows the GrTextContext-derived classes to add their batches to
     // the drawTarget.