Fix const correctness of containerForRepaint

Source/core/rendering/RenderLayerRepainter.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 55 matching lines @@
     // Until those states are fully fledged, I'll just disable the ASSERTS.
     DisableCompositingQueryAsserts disabler;
     if (m_renderer.layer()->hasVisibleContent()) {
         RenderView* view = m_renderer.view();
         ASSERT(view);
         // FIXME: LayoutState does not work with RenderLayers as there is not a 1-to-1
         // mapping between them and the RenderObjects. It would be neat to enable
         // LayoutState outside the layout() phase and use it here.
         ASSERT(!view->layoutStateEnabled());
 
-        RenderLayerModelObject* repaintContainer = m_renderer.containerForRepaint();
+        const RenderLayerModelObject* repaintContainer = m_renderer.containerForRepaint();
         LayoutRect oldRepaintRect = m_repaintRect;
         LayoutPoint oldOffset = m_offset;
         computeRepaintRects(repaintContainer);
         shouldCheckForRepaint &= shouldRepaintLayer();
 
         if (shouldCheckForRepaint) {
             if (view && !view->document().printing()) {
                 if (m_repaintStatus & NeedsFullRepaint) {
                     m_renderer.repaintUsingContainer(repaintContainer, pixelSnappedIntRect(oldRepaintRect), InvalidationLayer);
                     if (m_repaintRect != oldRepaintRect)
@@ skipping 49 matching lines @@
 
     if (m_repaintStatus != NeedsFullRepaintForPositionedMovementLayout)
         return true;
 
     // Composited layers that were moved during a positioned movement only
     // layout, don't need to be repainted. They just need to be recomposited.
     return m_renderer.compositingState() != PaintsIntoOwnBacking;
 }
 
 // Since we're only painting non-composited layers, we know that they all share the same repaintContainer.
-void RenderLayerRepainter::repaintIncludingNonCompositingDescendants(RenderLayerModelObject* repaintContainer)
+void RenderLayerRepainter::repaintIncludingNonCompositingDescendants(const RenderLayerModelObject* repaintContainer)
 {
     m_renderer.repaintUsingContainer(repaintContainer, pixelSnappedIntRect(m_renderer.clippedOverflowRectForRepaint(repaintContainer)), InvalidationLayer);
 
     for (RenderLayer* curr = m_renderer.layer()->firstChild(); curr; curr = curr->nextSibling()) {
         if (!curr->hasCompositedLayerMapping())
             curr->repainter().repaintIncludingNonCompositingDescendants(repaintContainer);
     }
 }
 
 LayoutRect RenderLayerRepainter::repaintRectIncludingNonCompositingDescendants() const
@@ skipping 112 matching lines @@
 RenderLayer* RenderLayerRepainter::enclosingFilterRepaintLayer() const
 {
     for (const RenderLayer* curr = m_renderer.layer(); curr; curr = curr->parent()) {
         if ((curr != m_renderer.layer() && curr->requiresFullLayerImageForFilters()) || curr->compositingState() == PaintsIntoOwnBacking || curr->isRootLayer())
             return const_cast<RenderLayer*>(curr);
     }
     return 0;
 }
 
 } // Namespace WebCore