Remove painting roots.

sky/engine/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 373 matching lines @@
     }
 
     return false;
 }
 
 // --------------------- painting stuff -------------------------------
 
 void RenderBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     LayoutPoint adjustedPaintOffset = paintOffset + location();
-    // default implementation. Just pass paint through to the children
-    PaintInfo childInfo(paintInfo);
-    childInfo.updatePaintingRootForChildren(this);
     for (RenderObject* child = slowFirstChild(); child; child = child->nextSibling())
-        child->paint(childInfo, adjustedPaintOffset);
+        child->paint(paintInfo, adjustedPaintOffset);
 }
 
 void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
 {
     const FillLayer& bgLayer = style()->backgroundLayers();
     Color bgColor = resolveColor(CSSPropertyBackgroundColor);
 
     paintFillLayers(paintInfo, bgColor, bgLayer, view()->backgroundRect(this), BackgroundBleedNone, this);
 }
 
@@ skipping 24 matching lines @@
     if (borderObscuresBackgroundEdge(contextScaling))
         return BackgroundBleedShrinkBackground;
     if (borderObscuresBackground() && backgroundHasOpaqueTopLayer())
         return BackgroundBleedBackgroundOverBorder;
 
     return BackgroundBleedClipBackground;
 }
 
 void RenderBox::paintBoxDecorationBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    if (!paintInfo.shouldPaintWithinRoot(this))
-        return;
-
     LayoutRect paintRect = borderBoxRect();
     paintRect.moveBy(paintOffset);
     paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, paintRect);
 }
 
 void RenderBox::paintBoxDecorationBackgroundWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
 {
     RenderStyle* style = this->style();
     BoxDecorationData boxDecorationData(*style);
     BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context, boxDecorationData);
@@ skipping 44 matching lines @@
         Color bgColor = resolveColor(CSSPropertyBackgroundColor);
         if (bgColor.alpha() == 255)
             return true;
     }
 
     return false;
 }
 
 void RenderBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    if (!paintInfo.shouldPaintWithinRoot(this) || paintInfo.phase != PaintPhaseMask)
+    if (paintInfo.phase != PaintPhaseMask)
         return;
 
     LayoutRect paintRect = LayoutRect(paintOffset, size());
     paintMaskImages(paintInfo, paintRect);
 }
 
 void RenderBox::paintMaskImages(const PaintInfo& paintInfo, const LayoutRect& paintRect)
 {
     paintFillLayers(paintInfo, Color::transparent, style()->maskLayers(), paintRect, BackgroundBleedNone);
     paintNinePieceImage(paintInfo.context, paintRect, style(), style()->maskBoxImage());
@@ skipping 2191 matching lines @@
 
 RenderBox::BoxDecorationData::BoxDecorationData(const RenderStyle& style)
 {
     backgroundColor = style.colorIncludingFallback(CSSPropertyBackgroundColor);
     hasBackground = backgroundColor.alpha() || style.hasBackgroundImage();
     ASSERT(hasBackground == style.hasBackground());
     hasBorder = style.hasBorder();
 }
 
 } // namespace blink