[selectors4] Use common ancestor strategy for :focus-within

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

Index: third_party/WebKit/Source/core/dom/ContainerNode.cpp
diff --git a/third_party/WebKit/Source/core/dom/ContainerNode.cpp b/third_party/WebKit/Source/core/dom/ContainerNode.cpp
index 3de58c2b8b065a3bc08c1e1f237b27374c12ecc8..1473d7c8d01bc6dffb15b32cb2714b340ea73385 100644
--- a/third_party/WebKit/Source/core/dom/ContainerNode.cpp
+++ b/third_party/WebKit/Source/core/dom/ContainerNode.cpp
@@ -1069,13 +1069,6 @@ void ContainerNode::SetFocused(bool received, WebFocusType focus_type) {
 
   FocusStateChanged();
 
-  UpdateDistribution();
-  for (ContainerNode* node = this; node;
-       node = FlatTreeTraversal::Parent(*node)) {
-    node->SetHasFocusWithin(received);
-    node->FocusWithinStateChanged();
-  }
-
   if (GetLayoutObject() || received)
     return;
 
@@ -1100,6 +1093,14 @@ void ContainerNode::SetFocused(bool received, WebFocusType focus_type) {
   }
 }
 
+void ContainerNode::SetHasFocusWithinUpToAncestor(bool flag, Node* ancestor) {
+  for (ContainerNode* node = this; node && node != ancestor;
+       node = FlatTreeTraversal::Parent(*node)) {
+    node->SetHasFocusWithin(flag);
+    node->FocusWithinStateChanged();
+  }
+}
+
 void ContainerNode::SetActive(bool down) {
   if (down == IsActive())
     return;