Disable some compositing state asserts seen on Mac builds

Source/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 456 matching lines @@
     // Forbid autoscrolls when scrollbars are off, but permits other programmatic scrolls,
     // like navigation to an anchor.
     Page* page = frameView->frame().page();
     if (!page)
         return false;
     return !page->autoscrollController().autoscrollInProgress();
 }
 
 void RenderBox::scrollRectToVisible(const LayoutRect& rect, const ScrollAlignment& alignX, const ScrollAlignment& alignY)
 {
+    // Presumably the same issue as in setScrollTop. See crbug.com/343132.
+    DisableCompositingQueryAsserts disabler;
+
     RenderBox* parentBox = 0;
     LayoutRect newRect = rect;
 
     bool restrictedByLineClamp = false;
     if (parent()) {
         parentBox = parent()->enclosingBox();
         restrictedByLineClamp = !parent()->style()->lineClamp().isNone();
     }
 
     if (hasOverflowClip() && !restrictedByLineClamp) {
@@ skipping 244 matching lines @@
     if (!isHorizontalWritingMode() && style()->overflowX() == OSCROLL) {
         ASSERT(layer()->scrollableArea() && layer()->scrollableArea()->hasHorizontalScrollbar());
         return horizontalScrollbarHeight();
     }
 
     return 0;
 }
 
 bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float delta)
 {
+    // Presumably the same issue as in setScrollTop. See crbug.com/343132.
+    DisableCompositingQueryAsserts disabler;
+
     // Logical scroll is a higher level concept, all directions by here must be physical
     ASSERT(!isLogical(direction));
 
     if (!layer() || !layer()->scrollableArea())
         return false;
 
     return layer()->scrollableArea()->scroll(direction, granularity, delta);
 }
 
 bool RenderBox::canBeScrolledAndHasScrollableArea() const
@@ skipping 3941 matching lines @@
         return 0;
 
     if (!layoutState && !flowThreadContainingBlock())
         return 0;
 
     RenderBlock* containerBlock = containingBlock();
     return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
 }
 
 } // namespace WebCore