Replace style sharing cousin list search with LRU

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index c1692498bb3c514883c54b58ce70dffce85383a9..82462cd5fca045e15cd4858bda45fc773fefae21 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1563,6 +1563,8 @@ void Element::recalcChildStyle(StyleRecalcChange change)
             if (shouldRecalcStyle(change, element)) {
                 parentPusher.push();
                 didReattach = element->recalcStyle(change);
+            } else if (document().styleResolver()->elementCanShareStyle(element)) {
+                document().styleResolver()->addToStyleSharingList(element);
             }
         }