Add SolidSidedWidgetBorder

ui/views/border.h

Index: ui/views/border.h
diff --git a/ui/views/border.h b/ui/views/border.h
index 2204b90a149c6be0ae4877ec50fd92834d10f122..56cf1bf211ca4bf5cfe661d05c57dafab7f4fb39 100644
--- a/ui/views/border.h
+++ b/ui/views/border.h
@@ -68,6 +68,12 @@ VIEWS_EXPORT std::unique_ptr<Border> NullBorder();
 VIEWS_EXPORT std::unique_ptr<Border> CreateSolidBorder(int thickness,
                                                        SkColor color);
 
+// Creates a border that is a simple line of the specified thickness and color,
+// using rounding that works well for views that are painted directly to a
+// a widget.
+VIEWS_EXPORT std::unique_ptr<Border> CreateSolidWidgetBorder(int thickness,
+                                                             SkColor color);
+
 // Creates a border that is a rounded rectangle of the specified thickness and
 // color.
 VIEWS_EXPORT std::unique_ptr<Border> CreateRoundedRectBorder(int thickness,