Start on replacing path+style with shape in patherenderer

src/gpu/GrStyle.h

Index: src/gpu/GrStyle.h
diff --git a/src/gpu/GrStyle.h b/src/gpu/GrStyle.h
index 326f800442c9d2061102ffa2bcfc89b25a552ffc..478564f3f918196125269e9bcd10b523a313390a 100644
--- a/src/gpu/GrStyle.h
+++ b/src/gpu/GrStyle.h
@@ -113,6 +113,13 @@ public:
     /** Is this style a hairline with no path effect? */
     bool isSimpleHairline() const { return fStrokeRec.isHairlineStyle() && !fPathEffect; }
 
+    bool couldBeHairline() const {
+        // If the original stroke rec has hairline style then either a null or dash patheffect
+        // would preserve the hairline status. An arbitrary path effect could introduce hairline
+        // style.
+        return this->strokeRec().isHairlineStyle() || this->hasNonDashPathEffect();
+    }
+
     SkPathEffect* pathEffect() const { return fPathEffect.get(); }
 
     bool hasPathEffect() const { return SkToBool(fPathEffect.get()); }