[css-display] Support display: contents pseudo-elements.

third_party/WebKit/Source/core/layout/LayoutCounter.cpp

Index: third_party/WebKit/Source/core/layout/LayoutCounter.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutCounter.cpp b/third_party/WebKit/Source/core/layout/LayoutCounter.cpp
index 55ee982b0f78eb24fdfaaa542acac778bd3ee22c..e1032f1a69446c395968d378399a169b7de57432 100644
--- a/third_party/WebKit/Source/core/layout/LayoutCounter.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutCounter.cpp
@@ -424,11 +424,12 @@ static CounterNode* makeCounterNodeIfNeeded(LayoutObject& object,
   return newNode.get();
 }
 
-LayoutCounter::LayoutCounter(Document* node, const CounterContent& counter)
-    : LayoutText(node, StringImpl::empty),
+LayoutCounter::LayoutCounter(PseudoElement& node, const CounterContent& counter)
+    : LayoutText(nullptr, StringImpl::empty),
       m_counter(counter),
       m_counterNode(nullptr),
       m_nextForSameCounter(nullptr) {
+  setPseudoForAnonymous(node);
   view()->addLayoutCounter();
 }