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

Source/core/rendering/RenderMenuList.cpp

 /*
  * This file is part of the select element renderer in WebCore.
  *
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 35 matching lines @@
 #include "platform/geometry/IntSize.h"
 #include "platform/text/PlatformLocale.h"
 #include <math.h>
 
 namespace blink {
 
 using namespace HTMLNames;
 
 RenderMenuList::RenderMenuList(Element* element)
     : RenderFlexibleBox(element)
-    , m_buttonText(0)
-    , m_innerBlock(0)
+    , m_buttonText(nullptr)
+    , m_innerBlock(nullptr)
     , m_optionsChanged(true)
     , m_optionsWidth(0)
     , m_lastActiveIndex(-1)
     , m_popupIsVisible(false)
 {
     ASSERT(isHTMLSelectElement(element));
 }
 
 RenderMenuList::~RenderMenuList()
 {
     if (m_popup)
         m_popup->disconnectClient();
     m_popup = nullptr;
 }
 
+void RenderMenuList::trace(Visitor* visitor)
+{
+    visitor->trace(m_buttonText);
+    visitor->trace(m_innerBlock);
+    RenderFlexibleBox::trace(visitor);
+}
+
 // FIXME: Instead of this hack we should add a ShadowRoot to <select> with no insertion point
 // to prevent children from rendering.
 bool RenderMenuList::isChildAllowed(RenderObject* object, RenderStyle*) const
 {
     return object->isAnonymous() && !object->isRenderFullScreen();
 }
 
 void RenderMenuList::createInnerBlock()
 {
     if (m_innerBlock) {
@@ skipping 49 matching lines @@
     ASSERT(m_innerBlock == firstChild());
 
     if (AXObjectCache* cache = document().existingAXObjectCache())
         cache->childrenChanged(this);
 }
 
 void RenderMenuList::removeChild(RenderObject* oldChild)
 {
     if (oldChild == m_innerBlock || !m_innerBlock) {
         RenderFlexibleBox::removeChild(oldChild);
-        m_innerBlock = 0;
+        m_innerBlock = nullptr;
     } else
         m_innerBlock->removeChild(oldChild);
 }
 
 void RenderMenuList::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderBlock::styleDidChange(diff, oldStyle);
 
     if (m_buttonText)
         m_buttonText->setStyle(style());
@@ skipping 380 matching lines @@
         itemBackgroundColor = backgroundColor;
         return;
     }
 
     // If the menu background is not opaque, then add an opaque white background behind.
     itemBackgroundColor = Color(Color::white).blend(backgroundColor);
 }
 
 PopupMenuStyle RenderMenuList::menuStyle() const
 {
-    const RenderObject* o = m_innerBlock ? m_innerBlock : this;
+    const RenderObject* o = m_innerBlock ? m_innerBlock.get() : this;
     const RenderStyle* s = o->style();
     return PopupMenuStyle(o->resolveColor(CSSPropertyColor), o->resolveColor(CSSPropertyBackgroundColor), s->font(), s->visibility() == VISIBLE,
         s->display() == NONE, s->textIndent(), style()->direction(), isOverride(style()->unicodeBidi()));
 }
 
 LayoutUnit RenderMenuList::clientPaddingLeft() const
 {
     return paddingLeft() + m_innerBlock->paddingLeft();
 }
 
@@ skipping 49 matching lines @@
     HTMLElement* element = listItems[listIndex];
     return isHTMLOptionElement(*element) && toHTMLOptionElement(*element).selected();
 }
 
 void RenderMenuList::setTextFromItem(unsigned listIndex)
 {
     setTextFromOption(selectElement()->listToOptionIndex(listIndex));
 }
 
 }