Walk render tree instead of render layers for paint.

sky/engine/core/rendering/RenderView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 173 matching lines @@
 
 void RenderView::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
 {
     if (mode & UseTransforms && shouldUseTransformFromContainer(0)) {
         TransformationMatrix t;
         getTransformFromContainer(0, LayoutSize(), t);
         transformState.applyTransform(t);
     }
 }
 
-void RenderView::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+void RenderView::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, Vector<RenderBox*>& layers)
 {
     // If we ever require layout but receive a paint anyway, something has gone horribly wrong.
     ASSERT(!needsLayout());
     // RenderViews should never be called to paint with an offset not on device pixels.
     ASSERT(LayoutPoint(IntPoint(paintOffset.x(), paintOffset.y())) == paintOffset);
 
     // This avoids painting garbage between columns if there is a column gap.
     if (m_frameView && style()->isOverflowPaged())
         paintInfo.context->fillRect(paintInfo.rect, m_frameView->baseBackgroundColor());
 
-    paintObject(paintInfo, paintOffset);
+    paintObject(paintInfo, paintOffset, layers);
 }
 
 static inline bool rendererObscuresBackground(RenderBox* rootBox)
 {
     ASSERT(rootBox);
     RenderStyle* style = rootBox->style();
     if (style->opacity() != 1
         || style->hasFilter()
         || style->hasTransform())
         return false;
@@ skipping 251 matching lines @@
     m_iframes.remove(iframe);
 }
 
 void RenderView::updateIFramesAfterLayout()
 {
     for (auto& iframe: m_iframes)
         iframe->updateWidgetBounds();
 }
 
 } // namespace blink