[selectors4] Implement :focus-within pseudo-class

third_party/WebKit/Source/core/dom/ContainerNode.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011, 2013 Apple Inc. All
  * rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 39 matching lines @@
   kChildrenOrSiblingsAffectedByActive = 1 << 2,
   kChildrenOrSiblingsAffectedByDrag = 1 << 3,
   kChildrenAffectedByFirstChildRules = 1 << 4,
   kChildrenAffectedByLastChildRules = 1 << 5,
   kChildrenAffectedByDirectAdjacentRules = 1 << 6,
   kChildrenAffectedByIndirectAdjacentRules = 1 << 7,
   kChildrenAffectedByForwardPositionalRules = 1 << 8,
   kChildrenAffectedByBackwardPositionalRules = 1 << 9,
   kAffectedByFirstChildRules = 1 << 10,
   kAffectedByLastChildRules = 1 << 11,
+  kChildrenOrSiblingsAffectedByFocusWithin = 1 << 12,
 
-  kNumberOfDynamicRestyleFlags = 12,
+  kNumberOfDynamicRestyleFlags = 13,
 
   kChildrenAffectedByStructuralRules =
       kChildrenAffectedByFirstChildRules | kChildrenAffectedByLastChildRules |
       kChildrenAffectedByDirectAdjacentRules |
       kChildrenAffectedByIndirectAdjacentRules |
       kChildrenAffectedByForwardPositionalRules |
       kChildrenAffectedByBackwardPositionalRules
 };
 
 enum SubtreeModificationAction {
@@ skipping 60 matching lines @@
   void RemoveChildren(
       SubtreeModificationAction = kDispatchSubtreeModifiedEvent);
 
   void CloneChildNodes(ContainerNode* clone);
 
   void AttachLayoutTree(const AttachContext& = AttachContext()) override;
   void DetachLayoutTree(const AttachContext& = AttachContext()) override;
   LayoutRect BoundingBox() const final;
   void SetFocused(bool, WebFocusType) override;
   void FocusStateChanged();
+  void FocusWithinStateChanged();
   void SetActive(bool = true) override;
   void SetDragged(bool) override;
   void SetHovered(bool = true) override;
 
   bool ChildrenOrSiblingsAffectedByFocus() const {
     return HasRestyleFlag(kChildrenOrSiblingsAffectedByFocus);
   }
   void SetChildrenOrSiblingsAffectedByFocus() {
     SetRestyleFlag(kChildrenOrSiblingsAffectedByFocus);
   }
 
+  bool ChildrenOrSiblingsAffectedByFocusWithin() const {
+    return HasRestyleFlag(kChildrenOrSiblingsAffectedByFocusWithin);
+  }
+  void SetChildrenOrSiblingsAffectedByFocusWithin() {
+    SetRestyleFlag(kChildrenOrSiblingsAffectedByFocusWithin);
+  }
+
   bool ChildrenOrSiblingsAffectedByHover() const {
     return HasRestyleFlag(kChildrenOrSiblingsAffectedByHover);
   }
   void SetChildrenOrSiblingsAffectedByHover() {
     SetRestyleFlag(kChildrenOrSiblingsAffectedByHover);
   }
 
   bool ChildrenOrSiblingsAffectedByActive() const {
     return HasRestyleFlag(kChildrenOrSiblingsAffectedByActive);
   }
@@ skipping 312 matching lines @@
 
 inline void GetChildNodes(ContainerNode& node, NodeVector& nodes) {
   DCHECK(!nodes.size());
   for (Node* child = node.FirstChild(); child; child = child->nextSibling())
     nodes.push_back(child);
 }
 
 }  // namespace blink
 
 #endif  // ContainerNode_h