added support for PLS path rendering

src/gpu/GrPathProcessor.h

Index: src/gpu/GrPathProcessor.h
diff --git a/src/gpu/GrPathProcessor.h b/src/gpu/GrPathProcessor.h
index 831770cc9bd9abb2bf7d1c143e63ee8da757e0d6..fdd849875f6daed4e77a70e779bc5f287b396d58 100644
--- a/src/gpu/GrPathProcessor.h
+++ b/src/gpu/GrPathProcessor.h
@@ -40,6 +40,8 @@ public:
 
     const GrXPOverridesForBatch& overrides() const { return fOverrides; }
 
+    virtual bool isPathRendering() const override { return true; }
+
 private:
     GrPathProcessor(GrColor color, const GrXPOverridesForBatch& overrides,
                     const SkMatrix& viewMatrix, const SkMatrix& localMatrix);