Reschedule sibling invalidations as descendant on removal.

third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp

Index: third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp b/third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp
index 5a57a75ceb356a93ecb2875899136dc3935f0c48..1e2b4b9b91c1646f16a9c2bacea8c6bdb29888f5 100644
--- a/third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp
+++ b/third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp
@@ -132,6 +132,25 @@ void StyleInvalidator::scheduleSiblingInvalidationsAsDescendants(
   }
 }
 
+void StyleInvalidator::rescheduleSiblingInvalidationsAsDescendants(
+    Element& element) {
+  PendingInvalidations* pendingInvalidations =
+      m_pendingInvalidationMap.get(&element);
+  if (!pendingInvalidations || pendingInvalidations->siblings().isEmpty())
+    return;
+
+  InvalidationLists invalidationLists;
+  for (const auto& invalidationSet : pendingInvalidations->siblings()) {
+    invalidationLists.descendants.push_back(invalidationSet);
+    if (DescendantInvalidationSet* descendants =
+            toSiblingInvalidationSet(*invalidationSet).siblingDescendants()) {
+      invalidationLists.descendants.push_back(descendants);
+    }
+  }
+  DCHECK(element.parentNode());

[esprehn, 2016/12/22 17:19:59]

I personally like to put these at the top of the function to make the call
invariants clear.

[rune, 2016/12/23 00:15:20]

Done.

+  scheduleInvalidationSetsForNode(invalidationLists, *element.parentNode());
+}
+
 void StyleInvalidator::clearInvalidation(ContainerNode& node) {
   if (!node.needsStyleInvalidation())
     return;