[selectors4] Implement :focus-within pseudo-class

third_party/WebKit/Source/core/dom/Node.cpp

Index: third_party/WebKit/Source/core/dom/Node.cpp
diff --git a/third_party/WebKit/Source/core/dom/Node.cpp b/third_party/WebKit/Source/core/dom/Node.cpp
index b91538efcfaa7eb5ae14c5775966265e5ac000d0..9bd2c7eb72d8201129eff3738bec6c1de1168976 100644
--- a/third_party/WebKit/Source/core/dom/Node.cpp
+++ b/third_party/WebKit/Source/core/dom/Node.cpp
@@ -2351,6 +2351,10 @@ void Node::SetFocused(bool flag) {
   GetDocument().UserActionElements().SetFocused(this, flag);
 }
 
+void Node::SetHasFocusWithin(bool flag) {
+  GetDocument().UserActionElements().SetHasFocusWithin(this, flag);
+}
+
 void Node::SetActive(bool flag) {
   GetDocument().UserActionElements().SetActive(this, flag);
 }
@@ -2388,6 +2392,11 @@ bool Node::IsUserActionElementFocused() const {
   return GetDocument().UserActionElements().IsFocused(this);
 }
 
+bool Node::IsUserActionElementHasFocusWithin() const {
+  DCHECK(IsUserActionElement());
+  return GetDocument().UserActionElements().HasFocusWithin(this);
+}
+
 void Node::SetCustomElementState(CustomElementState new_state) {
   CustomElementState old_state = GetCustomElementState();