Oilpan: add transition types to shadow DOM supporting objects.

Source/core/dom/shadow/InsertionPoint.cpp

Index: Source/core/dom/shadow/InsertionPoint.cpp
diff --git a/Source/core/dom/shadow/InsertionPoint.cpp b/Source/core/dom/shadow/InsertionPoint.cpp
index c26fef579fb1bbdc9d6988a81bc9f62e7102c55d..72c71c3dae2ab7544dfaaed3206bc611b8a906ad 100644
--- a/Source/core/dom/shadow/InsertionPoint.cpp
+++ b/Source/core/dom/shadow/InsertionPoint.cpp
@@ -152,7 +152,7 @@ bool InsertionPoint::isActive() const
         return true;
 
     // Slow path only when there are more than one shadow elements in a shadow tree. That should be a rare case.
-    const Vector<RefPtr<InsertionPoint> >& insertionPoints = shadowRoot->descendantInsertionPoints();
+    const WillBeHeapVector<RefPtrWillBeMember<InsertionPoint> >& insertionPoints = shadowRoot->descendantInsertionPoints();
     for (size_t i = 0; i < insertionPoints.size(); ++i) {
         InsertionPoint* point = insertionPoints[i].get();
         if (isHTMLShadowElement(*point))
@@ -245,6 +245,12 @@ void InsertionPoint::removedFrom(ContainerNode* insertionPoint)
     HTMLElement::removedFrom(insertionPoint);
 }
 
+void InsertionPoint::trace(Visitor* visitor)
+{
+    visitor->trace(m_distribution);
+    HTMLElement::trace(visitor);
+}
+
 const InsertionPoint* resolveReprojection(const Node* projectedNode)
 {
     ASSERT(projectedNode);
@@ -266,7 +272,7 @@ const InsertionPoint* resolveReprojection(const Node* projectedNode)
     return insertionPoint;
 }
 
-void collectDestinationInsertionPoints(const Node& node, Vector<InsertionPoint*, 8>& results)
+void collectDestinationInsertionPoints(const Node& node, WillBeHeapVector<RawPtrWillBeMember<InsertionPoint>, 8>& results)
 {
     const Node* current = &node;
     ElementShadow* lastElementShadow = 0;