First pass at deleting paint invalidation code.

sky/engine/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 353 matching lines @@
             // We need to set m_doFullPaintInvalidation before triggering layout as RenderObject::checkForPaintInvalidation
             // checks the boolean to disable local paint invalidations.
             m_doFullPaintInvalidation |= renderView()->shouldDoFullPaintInvalidationForNextLayout();
         }
 
         layer = rootForThisLayout->enclosingLayer();
 
         performLayout(rootForThisLayout, inSubtreeLayout);
 
         m_layoutSubtreeRoot = 0;
-        // We need to ensure that we mark up all renderers up to the RenderView
-        // for paint invalidation. This simplifies our code as we just always
-        // do a full tree walk.
-        if (RenderObject* container = rootForThisLayout->container())
-            container->setMayNeedPaintInvalidation(true);
     } // Reset m_layoutSchedulingEnabled to its previous value.
 
     layer->updateLayerPositionsAfterLayout();
 
     m_layoutCount++;
 
     ASSERT(!rootForThisLayout->needsLayout());
 
     scheduleOrPerformPostLayoutTasks();
 
@@ skipping 622 matching lines @@
     totalObjects = 0;
 
     for (RenderObject* o = root; o; o = o->nextInPreOrder(root)) {
         ++totalObjects;
         if (o->needsLayout())
             ++needsLayoutObjects;
     }
 }
 
 } // namespace blink