Land layer squashing behind a flag

Source/core/rendering/RenderLayerClipper.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 36 matching lines @@
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 
 namespace WebCore {
 
 void RenderLayerClipper::updateClipRects(const ClipRectsContext& clipRectsContext)
 {
     ClipRectsType clipRectsType = clipRectsContext.clipRectsType;
     ASSERT(clipRectsType < NumCachedClipRectsTypes);
     if (m_clipRectsCache && m_clipRectsCache->getClipRects(clipRectsType, clipRectsContext.respectOverflowClip)) {
+        // FIXME: these asserts trigger for squashing. Need to update this code to support squashing as appropriate.
         ASSERT(clipRectsContext.rootLayer == m_clipRectsCache->m_clipRectsRoot[clipRectsType]);
         ASSERT(m_clipRectsCache->m_scrollbarRelevancy[clipRectsType] == clipRectsContext.overlayScrollbarSizeRelevancy);
 
 #ifdef CHECK_CACHED_CLIP_RECTS
         // This code is useful to check cached clip rects, but is too expensive to leave enabled in debug builds by default.
         ClipRectsContext tempContext(clipRectsContext);
         tempContext.clipRectsType = TemporaryClipRects;
         ClipRects clipRects;
         calculateClipRects(tempContext, clipRects);
         ASSERT(clipRects == *m_clipRectsCache->getClipRects(clipRectsType, clipRectsContext.respectOverflowClip).get());
@@ skipping 114 matching lines @@
         if (m_renderer->hasClip()) {
             LayoutRect newPosClip = toRenderBox(m_renderer)->clipRect(offset, clipRectsContext.region);
             clipRects.setPosClipRect(intersection(newPosClip, clipRects.posClipRect()));
             clipRects.setOverflowClipRect(intersection(newPosClip, clipRects.overflowClipRect()));
             clipRects.setFixedClipRect(intersection(newPosClip, clipRects.fixedClipRect()));
         }
     }
 }
 
 } // namespace WebCore