Persist invalidation sets on detach root

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 bcc1d15d6ee48710ad925aa2daf4b702795cb456..7ed010a47ed73b972232965f01854230d85092e4 100644
--- a/third_party/WebKit/Source/core/dom/ContainerNode.cpp
+++ b/third_party/WebKit/Source/core/dom/ContainerNode.cpp
@@ -604,8 +604,10 @@ void ContainerNode::removeBetween(Node* previousChild, Node* nextChild, Node& ol
 
     ASSERT(oldChild.parentNode() == this);
 
-    if (!oldChild.needsAttach())
-        oldChild.detach();
+    AttachContext context;
+    context.clearInvalidation = true;
+    if (!needsAttach() || !oldChild.needsAttach())
+        oldChild.detach(context);
 
     if (nextChild)
         nextChild->setPreviousSibling(previousChild);
@@ -883,6 +885,7 @@ void ContainerNode::detach(const AttachContext& context)
 {
     AttachContext childrenContext(context);
     childrenContext.resolvedStyle = nullptr;
+    childrenContext.clearInvalidation = true;
 
     for (Node* child = firstChild(); child; child = child->nextSibling())
         child->detach(childrenContext);