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

Source/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 67 matching lines @@
 
 RenderLayerScrollableArea::RenderLayerScrollableArea(RenderLayer& layer)
     : m_layer(layer)
     , m_inResizeMode(false)
     , m_scrollsOverflow(false)
     , m_scrollDimensionsDirty(true)
     , m_inOverflowRelayout(false)
     , m_nextTopmostScrollChild(0)
     , m_topmostScrollChild(0)
     , m_needsCompositedScrolling(false)
-    , m_scrollCorner(0)
-    , m_resizer(0)
+    , m_scrollCorner(nullptr)
+    , m_resizer(nullptr)
 {
     ScrollableArea::setConstrainsScrollingToContentEdge(false);
 
     Node* node = box().node();
     if (node && node->isElementNode()) {
         // We save and restore only the scrollOffset as the other scroll values are recalculated.
         Element* element = toElement(node);
         m_scrollOffset = element->savedLayerScrollOffset();
         if (!m_scrollOffset.isZero())
             scrollAnimator()->setCurrentPosition(FloatPoint(m_scrollOffset.width(), m_scrollOffset.height()));
@@ skipping 870 matching lines @@
     RenderObject* actualRenderer = rendererForScrollbar(box());
     RefPtr<RenderStyle> corner = box().hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), actualRenderer->style()) : PassRefPtr<RenderStyle>(nullptr);
     if (corner) {
         if (!m_scrollCorner) {
             m_scrollCorner = RenderScrollbarPart::createAnonymous(&box().document());
             m_scrollCorner->setParent(&box());
         }
         m_scrollCorner->setStyle(corner.release());
     } else if (m_scrollCorner) {
         m_scrollCorner->destroy();
-        m_scrollCorner = 0;
+        m_scrollCorner = nullptr;
     }
 }
 
 void RenderLayerScrollableArea::paintOverflowControls(GraphicsContext* context, const IntPoint& paintOffset, const IntRect& damageRect, bool paintingOverlayControls)
 {
     // Don't do anything if we have no overflow.
     if (!box().hasOverflowClip())
         return;
 
     IntPoint adjustedPaintOffset = paintOffset;
@@ skipping 247 matching lines @@
     RenderObject* actualRenderer = rendererForScrollbar(box());
     RefPtr<RenderStyle> resizer = box().hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(RESIZER), actualRenderer->style()) : PassRefPtr<RenderStyle>(nullptr);
     if (resizer) {
         if (!m_resizer) {
             m_resizer = RenderScrollbarPart::createAnonymous(&box().document());
             m_resizer->setParent(&box());
         }
         m_resizer->setStyle(resizer.release());
     } else if (m_resizer) {
         m_resizer->destroy();
-        m_resizer = 0;
+        m_resizer = nullptr;
     }
 }
 
 void RenderLayerScrollableArea::drawPlatformResizerImage(GraphicsContext* context, IntRect resizerCornerRect)
 {
     float deviceScaleFactor = blink::deviceScaleFactor(box().frame());
 
     RefPtr<Image> resizeCornerImage;
     IntSize cornerResizerSize;
     if (deviceScaleFactor >= 2) {
@@ skipping 200 matching lines @@
 void RenderLayerScrollableArea::setTopmostScrollChild(RenderLayer* scrollChild)
 {
     // We only want to track the topmost scroll child for scrollable areas with
     // overlay scrollbars.
     if (!hasOverlayScrollbars())
         return;
     m_nextTopmostScrollChild = scrollChild;
 }
 
 } // namespace blink