Oilpan: add transition types to shadow DOM supporting objects.

Source/core/dom/shadow/InsertionPoint.h

Index: Source/core/dom/shadow/InsertionPoint.h
diff --git a/Source/core/dom/shadow/InsertionPoint.h b/Source/core/dom/shadow/InsertionPoint.h
index 76d983f35227e2c2186b99147dea424fe249851b..87c4ced4ffcd758555eaa1df447da49c496e9a09 100644
--- a/Source/core/dom/shadow/InsertionPoint.h
+++ b/Source/core/dom/shadow/InsertionPoint.h
@@ -68,6 +68,8 @@ public:
     Node* nextTo(const Node* node) const { return m_distribution.nextTo(node); }
     Node* previousTo(const Node* node) const { return m_distribution.previousTo(node); }
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 protected:
     InsertionPoint(const QualifiedName&, Document&);
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE;
@@ -81,7 +83,7 @@ private:
     bool m_registeredWithShadowRoot;
 };
 
-typedef Vector<RefPtr<InsertionPoint> > DestinationInsertionPoints;
+typedef WillBeHeapVector<RefPtrWillBeMember<InsertionPoint> > DestinationInsertionPoints;
 
 DEFINE_ELEMENT_TYPE_CASTS(InsertionPoint, isInsertionPoint());
 
@@ -111,7 +113,7 @@ inline ElementShadow* shadowWhereNodeCanBeDistributed(const Node& node)
 
 const InsertionPoint* resolveReprojection(const Node*);
 
-void collectDestinationInsertionPoints(const Node&, Vector<InsertionPoint*, 8>& results);
+void collectDestinationInsertionPoints(const Node&, WillBeHeapVector<RawPtrWillBeMember<InsertionPoint>, 8>& results);
 
 } // namespace WebCore