Ensure positioned descendants are invalidated if needed

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1205 matching lines @@
     // If we didn't need paint invalidation then our children don't need as well.
     // Skip walking down the tree as everything should be fine below us.
     if (!shouldCheckForPaintInvalidation(paintInvalidationState))
         return;
 
     invalidatePaintIfNeeded(paintInvalidationState, paintInvalidationState.paintInvalidationContainer());
     clearPaintInvalidationState(paintInvalidationState);
     invalidatePaintOfSubtreesIfNeeded(paintInvalidationState);
 }
 
-void RenderObject::invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& paintInvalidationState)
+void RenderObject::invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState)
 {
     for (RenderObject* child = slowFirstChild(); child; child = child->nextSibling()) {
         if (!child->isOutOfFlowPositioned())
-            child->invalidateTreeIfNeeded(paintInvalidationState);
+            child->invalidateTreeIfNeeded(childPaintInvalidationState);
     }
 }
 
 static PassRefPtr<TraceEvent::ConvertableToTraceFormat> jsonObjectForOldAndNewRects(const LayoutRect& oldRect, const LayoutPoint& oldLocation, const LayoutRect& newRect, const LayoutPoint& newLocation)
 {
     RefPtr<TracedValue> value = TracedValue::create();
     addJsonObjectForRect(value.get(), "oldRect", oldRect);
     addJsonObjectForPoint(value.get(), "oldLocation", oldLocation);
     addJsonObjectForRect(value.get(), "newRect", newRect);
     addJsonObjectForPoint(value.get(), "newLocation", newLocation);
@@ skipping 1899 matching lines @@
 {
     if (object1) {
         const blink::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif