Add optional sw generated path coverage mask caching

src/gpu/GrPathRendererChain.h

Index: src/gpu/GrPathRendererChain.h
diff --git a/src/gpu/GrPathRendererChain.h b/src/gpu/GrPathRendererChain.h
index 2a11a19cda86f7ac7fd519bbbc492c8371a060b2..8788374d71d490057cc507cbef739b262cd92232 100644
--- a/src/gpu/GrPathRendererChain.h
+++ b/src/gpu/GrPathRendererChain.h
@@ -25,6 +25,8 @@ class GrPathRendererChain : public SkNoncopyable {
 public:
     struct Options {
         bool fDisableDistanceFieldRenderer = false;
+        bool fAllowPathMaskCaching = false;
+        bool fDisableAllPathRenderers = false;
     };
     GrPathRendererChain(GrContext* context, const Options&);