Add an assertion to make sure NodeRenderingTraversal::parent is called after the distribution resul…

Source/core/dom/NodeRenderingTraversal.cpp

 /*
  * Copyright (C) 2012 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 36 matching lines @@
 
 void ParentDetails::didTraverseInsertionPoint(const InsertionPoint* insertionPoint)
 {
     if (!m_insertionPoint) {
         m_insertionPoint = insertionPoint;
     }
 }
 
 ContainerNode* parent(const Node* node, ParentDetails* details)
 {
-    // FIXME: We should probably ASSERT(!node->document().childNeedsDistributionRecalc()) here, but
-    // a bunch of things use NodeRenderingTraversal::parent in places where that looks like it could
-    // be false.
     ASSERT(node);
+    ASSERT(!node->document().childNeedsDistributionRecalc());
     if (isActiveInsertionPoint(*node))
         return 0;
     ComposedTreeWalker walker(node, ComposedTreeWalker::CanStartFromShadowBoundary);
     return toContainerNode(walker.traverseParent(walker.get(), details));
 }
 
 bool contains(const ContainerNode* container, const Node* node)
 {
     while (node) {
         if (node == container)
@@ skipping 180 matching lines @@
     for (size_t i = position + 1; i < topLayerElements.size(); ++i) {
         if (RenderObject* renderer = topLayerElements[i]->renderer())
             return renderer;
     }
     return 0;
 }
 
 }
 
 } // namespace