Make the compositing assert disabler for paint invalidation more targeted.

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 276 matching lines @@
     setScrollbarsSuppressed(true);
 }
 
 bool FrameView::didFirstLayout() const
 {
     return !m_firstLayout;
 }
 
 void FrameView::invalidateRect(const IntRect& rect)
 {
+    // For querying RenderLayer::compositingState() when invalidating scrollbars.
+    // FIXME: do all scrollbar invalidations after layout of all frames is complete. It's currently not recursively true.
+    DisableCompositingQueryAsserts disabler;
     if (!parent()) {
         if (HostWindow* window = hostWindow())
             window->invalidateContentsAndRootView(rect);
         return;
     }
 
     RenderPart* renderer = m_frame->ownerRenderer();
     if (!renderer)
         return;
 
@@ skipping 2693 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace blink