Schedule sibling invalidation sets for sibling insert/remove.

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 a6a9e97eb93c60761f4b17c731b2198ff525dcb3..7a19138c8213271b8f4d9676d13de203d8611f81 100644
--- a/third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp
+++ b/third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.cpp
@@ -88,6 +88,46 @@ void StyleInvalidator::scheduleInvalidationSetsForElement(const InvalidationList
     }
 }
 
+void StyleInvalidator::rescheduleSiblingInvalidationSetsForRemovedElement(Element& elementFrom, Element& elementTo, bool invalidateElementTo)
+{
+    PendingInvalidations* pendingInvalidationsFrom = m_pendingInvalidationMap.get(&elementFrom);
+    if (!pendingInvalidationsFrom || pendingInvalidationsFrom->siblings().isEmpty())
+        return;
+
+    scheduleDescendantsFromSiblingSets(elementTo, pendingInvalidationsFrom->siblings());
+    ensurePendingInvalidations(elementTo).siblings().appendVector(pendingInvalidationsFrom->siblings());
+    elementTo.setNeedsStyleInvalidation();
+}
+
+void StyleInvalidator::scheduleDescendantsFromSiblingSets(Element& element, const InvalidationSetVector& siblingSets)
+{
+    bool needsStyleInvalidation = false;
+    PendingInvalidations& pendingInvalidations = ensurePendingInvalidations(element);
+    for (const auto& invalidationSet : siblingSets) {
+        if (!invalidationSet->invalidatesElement(element))
+            continue;
+
+        if (invalidationSet->invalidatesSelf())
+            element.setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
+
+        DescendantInvalidationSet* descendants = toSiblingInvalidationSet(*invalidationSet).siblingDescendants();
+        if (!descendants)
+            continue;
+
+        if (descendants->wholeSubtreeInvalid()) {
+            element.setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
+            continue;
+        }
+        if (descendants->isEmpty())
+            continue;
+
+        pendingInvalidations.descendants().append(descendants);
+        needsStyleInvalidation = true;
+    }
+    if (needsStyleInvalidation)
+        element.setNeedsStyleInvalidation();
+}
+
 void StyleInvalidator::clearInvalidation(Element& element)
 {
     if (!element.needsStyleInvalidation())