[CSS Regions] Elements in a region should be assignable to a named flow

Source/core/rendering/FlowThreadController.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 98 matching lines @@
     ASSERT(namedFlow);
     ASSERT(!m_mapNamedFlowContentNodes.contains(contentNode));
     ASSERT(!namedFlow->hasContentNode(contentNode));
     m_mapNamedFlowContentNodes.add(contentNode, namedFlow);
     namedFlow->registerNamedFlowContentNode(contentNode);
 }
 
 void FlowThreadController::unregisterNamedFlowContentNode(Node* contentNode)
 {
     ASSERT(contentNode && contentNode->isElementNode());
-    HashMap<Node*, RenderNamedFlowThread*>::iterator it = m_mapNamedFlowContentNodes.find(contentNode);
+    HashMap<const Node*, RenderNamedFlowThread*>::iterator it = m_mapNamedFlowContentNodes.find(contentNode);
     ASSERT(it != m_mapNamedFlowContentNodes.end());
     ASSERT(it->value);
     ASSERT(it->value->hasContentNode(contentNode));
     it->value->unregisterNamedFlowContentNode(contentNode);
     m_mapNamedFlowContentNodes.remove(contentNode);
 }
 
 void FlowThreadController::updateFlowThreadsChainIfNecessary()
 {
     ASSERT(m_renderNamedFlowThreadList);
@@ skipping 88 matching lines @@
         flowRenderer->layoutIfNeeded();
         if (flowRenderer->hasAutoLogicalHeightRegions()) {
             ASSERT(flowRenderer->needsTwoPhasesLayout());
             flowRenderer->markAutoLogicalHeightRegionsForLayout();
         }
         flowRenderer->setInConstrainedLayoutPhase(true);
         flowRenderer->clearNeedsTwoPhasesLayout();
     }
 }
 
+bool FlowThreadController::isContentNodeRegisteredWithAnyNamedFlow(const Node* contentNode) const
+{
+    return m_mapNamedFlowContentNodes.contains(contentNode);
+}
+
 #ifndef NDEBUG
 bool FlowThreadController::isAutoLogicalHeightRegionsCountConsistent() const
 {
     if (!hasRenderNamedFlowThreads())
         return !hasFlowThreadsWithAutoLogicalHeightRegions();
 
     for (RenderNamedFlowThreadList::iterator iter = m_renderNamedFlowThreadList->begin(); iter != m_renderNamedFlowThreadList->end(); ++iter) {
         if (!(*iter)->isAutoLogicalHeightRegionsCountConsistent())
             return false;
     }
 
     return true;
 }
 #endif
 
 } // namespace WebCore