Extract gpu line dashing to GrDashLinePathRenderer

src/gpu/effects/GrDashingEffect.h

Index: src/gpu/effects/GrDashingEffect.h
diff --git a/src/gpu/effects/GrDashingEffect.h b/src/gpu/effects/GrDashingEffect.h
index 26b016bcac34af8505434844f7c09f3a5f78a96f..999abb23d8e4e4e668dc55950d7da07496ffb50a 100644
--- a/src/gpu/effects/GrDashingEffect.h
+++ b/src/gpu/effects/GrDashingEffect.h
@@ -22,8 +22,10 @@ class GrStrokeInfo;
 
 namespace GrDashingEffect {
     bool DrawDashLine(GrGpu*, GrDrawTarget*, GrPipelineBuilder*, GrColor,
-                      const SkMatrix& viewMatrix, const SkPoint pts[2], const GrPaint& paint,
+                      const SkMatrix& viewMatrix, const SkPoint pts[2], bool useAA,
                       const GrStrokeInfo& strokeInfo);
+    bool CanDrawDashLine(const SkPoint pts[2], const GrStrokeInfo& strokeInfo,
+                         const SkMatrix& viewMatrix);
 }
 
 #endif