Fix focus navigation for nested slot case

third_party/WebKit/Source/core/dom/shadow/SlotScopedTraversal.h

Index: third_party/WebKit/Source/core/dom/shadow/SlotScopedTraversal.h
diff --git a/third_party/WebKit/Source/core/dom/shadow/SlotScopedTraversal.h b/third_party/WebKit/Source/core/dom/shadow/SlotScopedTraversal.h
index fa780b70325d468edf57f07a4bcae56fbab628f2..df9b0eaa7e851f5ea91d4a25aa9005ee3f812f23 100644
--- a/third_party/WebKit/Source/core/dom/shadow/SlotScopedTraversal.h
+++ b/third_party/WebKit/Source/core/dom/shadow/SlotScopedTraversal.h
@@ -13,9 +13,13 @@ class HTMLSlotElement;
 class SlotScopedTraversal {
  public:
   static HTMLSlotElement* findScopeOwnerSlot(const Element&);
-  static Element* nearestAncestorAssignedToSlot(const Element&);
+  static Element* nearestInclusiveAncestorAssignedToSlot(const Element&);
   static Element* next(const Element&);
   static Element* previous(const Element&);
+  static Element* lastWithin(const Element&);
+  static Element* firstAssignedToSlot(HTMLSlotElement&);
+  static Element* lastAssignedToSlot(HTMLSlotElement&);
+
   static bool isSlotScoped(const Element&);
 };