Add control over whether lines are special cased in SkDashPath. Disable when called from GrShape.

src/gpu/GrShape.h

Index: src/gpu/GrShape.h
diff --git a/src/gpu/GrShape.h b/src/gpu/GrShape.h
index 3efb66fd6b8522e396a7b3173adcd40d2e058504..93896ce3f0a532cfcfd71a41a3610e32b2060505 100644
--- a/src/gpu/GrShape.h
+++ b/src/gpu/GrShape.h
@@ -168,6 +168,17 @@ public:
         return true;
     }
 
+    /**
+     * If the unstyled shape is a straight line segment, returns true and sets pts to the endpoints.
+     * An inverse filled line path is still considered a line.
+     */
+     bool asLine(SkPoint pts[2]) const {
+         if (fType != Type::kPath) {
+             return false;
+         }
+         return fPath.get()->isLine(pts);
+     }
+
     /** Returns the unstyled geometry as a path. */
     void asPath(SkPath* out) const {
         switch (fType) {