Merge "CSS Selector: Fix a regression of :first-child and :last-child invalidation" to M58.

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 cfe0428c4d1150b125568ba6936061c3c3ebea3b..00422e14e2eb82e111f910c46119c1aebca2570a 100644
--- a/third_party/WebKit/Source/core/dom/ContainerNode.cpp
+++ b/third_party/WebKit/Source/core/dom/ContainerNode.cpp
@@ -229,9 +229,12 @@ void ContainerNode::insertNodeVector(const NodeVector& targets,
       notifyNodeInsertedInternal(child, postInsertionNotificationTargets);
     }
   }
-  for (const auto& targetNode : targets)
-    childrenChanged(
-        ChildrenChange::forInsertion(*targetNode, ChildrenChangeSourceAPI));
+  Node* unchangedPrevious =
+      targets.size() > 0 ? targets[0]->previousSibling() : nullptr;
+  for (const auto& targetNode : targets) {
+    childrenChanged(ChildrenChange::forInsertion(
+        *targetNode, unchangedPrevious, next, ChildrenChangeSourceAPI));
+  }
   for (const auto& descendant : postInsertionNotificationTargets) {
     if (descendant->isConnected())
       descendant->didNotifySubtreeInsertionsToDocument();
@@ -714,7 +717,8 @@ void ContainerNode::notifyNodeInserted(Node& root,
   NodeVector postInsertionNotificationTargets;
   notifyNodeInsertedInternal(root, postInsertionNotificationTargets);
 
-  childrenChanged(ChildrenChange::forInsertion(root, source));
+  childrenChanged(ChildrenChange::forInsertion(root, root.previousSibling(),
+                                               root.nextSibling(), source));
 
   for (const auto& targetNode : postInsertionNotificationTargets) {
     if (targetNode->isConnected())