[selectors4] Implement :focus-within pseudo-class

third_party/WebKit/Source/core/dom/Node.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) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 372 matching lines @@
     return IsUserActionElement() && IsUserActionElementHovered();
   }
   // Note: As a shadow host whose root with delegatesFocus=false may become
   // focused state when an inner element gets focused, in that case more than
   // one elements in a document can return true for |isFocused()|.  Use
   // Element::isFocusedElementInDocument() or Document::focusedElement() to
   // check which element is exactly focused.
   bool IsFocused() const {
     return IsUserActionElement() && IsUserActionElementFocused();
   }
+  bool HasFocusWithin() const {
+    return IsUserActionElement() && IsUserActionElementHasFocusWithin();
+  }
 
   bool NeedsAttach() const {
     return GetStyleChangeType() == kNeedsReattachStyleChange;
   }
   bool NeedsStyleRecalc() const {
     return GetStyleChangeType() != kNoStyleChange;
   }
   StyleChangeType GetStyleChangeType() const {
     return static_cast<StyleChangeType>(node_flags_ & kStyleChangeMask);
   }
@@ skipping 67 matching lines @@
   void UpdateDistribution();
 
   void SetIsLink(bool f);
 
   bool HasEventTargetData() const { return GetFlag(kHasEventTargetDataFlag); }
   void SetHasEventTargetData(bool flag) {
     SetFlag(flag, kHasEventTargetDataFlag);
   }
 
   virtual void SetFocused(bool flag);
+  virtual void SetHasFocusWithin(bool flag);
   virtual void SetActive(bool flag = true);
   virtual void SetDragged(bool flag);
   virtual void SetHovered(bool flag = true);
 
   virtual int tabIndex() const;
 
   virtual Node* FocusDelegate();
   // This is called only when the node is focused.
   virtual bool ShouldHaveFocusAppearance() const;
 
@@ skipping 405 matching lines @@
   // during "commit". The main thread is stopped at that time, but
   // it is not safe to cache AtomicStrings because those are
   // per-thread.
   virtual String DebugNodeName() const;
 
   bool IsUserActionElementActive() const;
   bool IsUserActionElementInActiveChain() const;
   bool IsUserActionElementDragged() const;
   bool IsUserActionElementHovered() const;
   bool IsUserActionElementFocused() const;
+  bool IsUserActionElementHasFocusWithin() const;
 
   void RecalcDistribution();
 
   void SetStyleChange(StyleChangeType);
 
   virtual const ComputedStyle* VirtualEnsureComputedStyle(
       PseudoId = kPseudoIdNone);
 
   void TrackForDebugging();
 
@@ skipping 78 matching lines @@
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif  // Node_h