1 files changed, 20 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/FlowThreadController.cpp b/Source/WebCore/rendering/FlowThreadController.cpp
index 9edd0aa7e..cb4bdb1f2 100644
--- a/Source/WebCore/rendering/FlowThreadController.cpp
+++ b/Source/WebCore/rendering/FlowThreadController.cpp
@@ -49,6 +49,7 @@ FlowThreadController::FlowThreadController(RenderView* view)
     : m_view(view)
     , m_currentRenderFlowThread(0)
     , m_isRenderNamedFlowThreadOrderDirty(false)
+    , m_autoLogicalHeightRegionsCount(0)
 {
 }
 
@@ -98,6 +99,8 @@ void FlowThreadController::layoutRenderNamedFlowThreads()
 {
     ASSERT(m_renderNamedFlowThreadList);
 
+    ASSERT(isAutoLogicalHeightRegionsFlagConsistent());
+
     // Remove the left-over flow threads.
     RenderNamedFlowThreadList toRemoveList;
     for (RenderNamedFlowThreadList::iterator iter = m_renderNamedFlowThreadList->begin(); iter != m_renderNamedFlowThreadList->end(); ++iter) {
@@ -156,4 +159,21 @@ void FlowThreadController::unregisterNamedFlowContentNode(Node* contentNode)
     m_mapNamedFlowContentNodes.remove(contentNode);
 }
 
+#ifndef NDEBUG
+bool FlowThreadController::isAutoLogicalHeightRegionsFlagConsistent() const
+{
+    if (!hasRenderNamedFlowThreads())
+        return !hasAutoLogicalHeightRegions();
+
+    // Count the number of auto height regions
+    unsigned autoLogicalHeightRegions = 0;
+    for (RenderNamedFlowThreadList::iterator iter = m_renderNamedFlowThreadList->begin(); iter != m_renderNamedFlowThreadList->end(); ++iter) {
+        RenderNamedFlowThread* flowRenderer = *iter;
+        autoLogicalHeightRegions += flowRenderer->autoLogicalHeightRegionsCount();
+    }
+
+    return autoLogicalHeightRegions == m_autoLogicalHeightRegionsCount;
+}
+#endif
+
 } // namespace WebCore