Oilpan: move editing objects to the heap.

Source/core/editing/EditCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007 Apple, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/dom/Document.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/editing/CompositeEditCommand.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/LocalFrame.h"
 
 namespace WebCore {
 
 EditCommand::EditCommand(Document& document)
     : m_document(&document)
-    , m_parent(0)
+    , m_parent(nullptr)
 {
     ASSERT(m_document);
     ASSERT(m_document->frame());
     setStartingSelection(m_document->frame()->selection().selection());
     setEndingSelection(m_startingSelection);
 }
 
 EditCommand::EditCommand(Document* document, const VisibleSelection& startingSelection, const VisibleSelection& endingSelection)
     : m_document(document)
-    , m_parent(0)
+    , m_parent(nullptr)
 {
     ASSERT(m_document);
     ASSERT(m_document->frame());
     setStartingSelection(startingSelection);
     setEndingSelection(endingSelection);
 }
 
 EditCommand::~EditCommand()
 {
 }
@@ skipping 53 matching lines @@
         m_startingSelection = parent->m_endingSelection;
         m_endingSelection = parent->m_endingSelection;
     }
 }
 
 void SimpleEditCommand::doReapply()
 {
     doApply();
 }
 
+void EditCommand::trace(Visitor* visitor)
+{
+    visitor->trace(m_document);
+    visitor->trace(m_startingSelection);
+    visitor->trace(m_endingSelection);
+    visitor->trace(m_parent);
+}
+
 } // namespace WebCore