Oilpan: add transition types to shadow DOM supporting objects.

Source/core/dom/shadow/ContentDistribution.cpp

Index: Source/core/dom/shadow/ContentDistribution.cpp
diff --git a/Source/core/dom/shadow/ContentDistribution.cpp b/Source/core/dom/shadow/ContentDistribution.cpp
index a53ff57b81b0ce149d5c118210d4e70968ef7032..6b5bed5d153ccf47021968dbce812d7243416923 100644
--- a/Source/core/dom/shadow/ContentDistribution.cpp
+++ b/Source/core/dom/shadow/ContentDistribution.cpp
@@ -37,7 +37,7 @@ void ContentDistribution::swap(ContentDistribution& other)
     m_indices.swap(other.m_indices);
 }
 
-void ContentDistribution::append(PassRefPtr<Node> node)
+void ContentDistribution::append(PassRefPtrWillBeRawPtr<Node> node)
 {
     ASSERT(node);
     ASSERT(!isActiveInsertionPoint(*node));
@@ -48,7 +48,7 @@ void ContentDistribution::append(PassRefPtr<Node> node)
 
 size_t ContentDistribution::find(const Node* node) const
 {
-    HashMap<const Node*, size_t>::const_iterator it = m_indices.find(node);
+    WillBeHeapHashMap<RawPtrWillBeMember<const Node>, size_t>::const_iterator it = m_indices.find(node);
     if (it == m_indices.end())
         return kNotFound;
 
@@ -71,4 +71,10 @@ Node* ContentDistribution::previousTo(const Node* node) const
     return at(index - 1).get();
 }
 
+void ContentDistribution::trace(Visitor* visitor)
+{
+    visitor->trace(m_nodes);
+    visitor->trace(m_indices);
+}
+
 } // namespace WebCore