Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/rendering/RenderObjectChildList.cpp

Index: Source/core/rendering/RenderObjectChildList.cpp
diff --git a/Source/core/rendering/RenderObjectChildList.cpp b/Source/core/rendering/RenderObjectChildList.cpp
index 6a5e74f0f7ecd9d79d4b924fb1c61fb2dde3ea57..0a9798bcdeb520ece2b2873c0cc4f8697ffc53d6 100644
--- a/Source/core/rendering/RenderObjectChildList.cpp
+++ b/Source/core/rendering/RenderObjectChildList.cpp
@@ -35,6 +35,12 @@
 
 namespace blink {
 
+void RenderObjectChildList::trace(Visitor* visitor)
+{
+    visitor->trace(m_firstChild);
+    visitor->trace(m_lastChild);
+}
+
 void RenderObjectChildList::destroyLeftoverChildren()
 {
     while (firstChild()) {