Remove some unused paint invalidation members from RenderObject.

sky/engine/core/rendering/RenderBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 65 matching lines @@
     SubtreeLayoutScope layoutScope(*this);
 
     layoutBlockFlow(relayoutChildren, layoutScope);
 
     updateLayerTransformAfterLayout();
 
     // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if
     // we overflow or not.
     updateScrollInfoAfterLayout();
 
-    if (m_paintInvalidationLogicalTop != m_paintInvalidationLogicalBottom)
-        setShouldInvalidateOverflowForPaint(true);
-
     clearNeedsLayout();
 }
 
 inline void RenderBlockFlow::layoutBlockFlow(bool relayoutChildren, SubtreeLayoutScope& layoutScope)
 {
     LayoutUnit oldLeft = logicalLeft();
     bool logicalWidthChanged = updateLogicalWidthAndColumnWidth();
     relayoutChildren |= logicalWidthChanged;
 
     LayoutState state(*this, locationOffset(), logicalWidthChanged);
 
     LayoutUnit beforeEdge = borderBefore() + paddingBefore();
     LayoutUnit afterEdge = borderAfter() + paddingAfter();
     LayoutUnit previousHeight = logicalHeight();
     setLogicalHeight(beforeEdge);
 
-    m_paintInvalidationLogicalTop = 0;
-    m_paintInvalidationLogicalBottom = 0;
-
-    layoutChildren(relayoutChildren, layoutScope, m_paintInvalidationLogicalTop, m_paintInvalidationLogicalBottom, beforeEdge, afterEdge);
+    layoutChildren(relayoutChildren, layoutScope, beforeEdge, afterEdge);
 
     LayoutUnit oldClientAfterEdge = clientLogicalBottom();
 
     updateLogicalHeight();
 
     if (previousHeight != logicalHeight())
         relayoutChildren = true;
 
     layoutPositionedObjects(relayoutChildren || isDocumentElement(), oldLeft != logicalLeft() ? ForcedLayoutAfterContainingBlockMoved : DefaultLayout);
 
@@ skipping 20 matching lines @@
 void RenderBlockFlow::layoutBlockChild(RenderBox* child)
 {
     child->computeAndSetBlockDirectionMargins(this);
     LayoutUnit marginBefore = marginBeforeForChild(child);
     child->setY(logicalHeight() + marginBefore);
     child->layoutIfNeeded();
     determineLogicalLeftPositionForChild(child);
     setLogicalHeight(logicalHeight() + marginBefore + logicalHeightForChild(child) + marginAfterForChild(child));
 }
 
-void RenderBlockFlow::layoutChildren(bool relayoutChildren, SubtreeLayoutScope& layoutScope, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutUnit beforeEdge, LayoutUnit afterEdge)
+void RenderBlockFlow::layoutChildren(bool relayoutChildren, SubtreeLayoutScope& layoutScope, LayoutUnit beforeEdge, LayoutUnit afterEdge)
 {
     dirtyForLayoutFromPercentageHeightDescendants(layoutScope);
 
     RenderBox* next = firstChildBox();
     RenderBox* lastNormalFlowChild = 0;
 
     while (next) {
         RenderBox* child = next;
         next = child->nextSiblingBox();
 
@@ skipping 205 matching lines @@
     float logicalLeft = logicalLeftOffsetForLine(false).toFloat();
     float availableLogicalWidth = logicalRightOffsetForLine(false) - logicalLeft;
     updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
     if (!style()->isLeftToRightDirection())
         return logicalWidth() - logicalLeft;
     return logicalLeft;
 }
 
 } // namespace blink