Start on replacing path+style with shape in patherenderer

src/gpu/GrStyle.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrStyle_DEFINED
 #define GrStyle_DEFINED
 
@@ skipping 95 matching lines @@
             fStrokeRec.setHairlineStyle();
         }
     }
 
     /** Is this style a fill with no path effect? */
     bool isSimpleFill() const { return fStrokeRec.isFillStyle() && !fPathEffect; }
 
     /** 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()); }
 
     bool hasNonDashPathEffect() const { return fPathEffect.get() && !this->isDashed(); }
 
     bool isDashed() const { return SkPathEffect::kDash_DashType == fDashInfo.fType; }
     SkScalar dashPhase() const {
         SkASSERT(this->isDashed());
         return fDashInfo.fPhase;
@@ skipping 76 matching lines @@
     };
 
     bool applyPathEffect(SkPath* dst, SkStrokeRec* strokeRec, const SkPath& src) const;
 
     SkStrokeRec         fStrokeRec;
     sk_sp<SkPathEffect> fPathEffect;
     DashInfo            fDashInfo;
 };
 
 #endif