InitialColumnHeightFinder needs to take all expected rows into account.

third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp

 /*
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 573 matching lines @@
 LayoutMultiColumnFlowThread::enclosingFragmentationContext() const {
   if (LayoutMultiColumnFlowThread* enclosingFlowThread =
           this->enclosingFlowThread())
     return enclosingFlowThread;
   return view()->fragmentationContext();
 }
 
 void LayoutMultiColumnFlowThread::appendNewFragmentainerGroupIfNeeded(
     LayoutUnit offsetInFlowThread,
     PageBoundaryRule pageBoundaryRule) {
-  if (!isPageLogicalHeightKnown()) {
-    // If we have no clue about the height of the multicol container, bail. This
-    // situation occurs initially when an auto-height multicol container is
-    // nested inside another auto-height multicol container. We need at least an
-    // estimated height of the outer multicol container before we can check what
-    // an inner fragmentainer group has room for.
-    // Its height is indefinite for now.
-    return;
-  }
   LayoutMultiColumnSet* columnSet =
       columnSetAtBlockOffset(offsetInFlowThread, pageBoundaryRule);
-  if (columnSet->isInitialHeightCalculated()) {
-    // We only insert additional fragmentainer groups in the initial layout
-    // pass. We only want to balance columns in the last fragmentainer group (if
-    // we need to balance at all), so we want that last fragmentainer group to
-    // be the same one in all layout passes that follow.
+  if (!columnSet->newFragmentainerGroupsAllowed())
     return;
-  }
 
   if (!columnSet->hasFragmentainerGroupForColumnAt(offsetInFlowThread,
                                                    pageBoundaryRule)) {
     FragmentationContext* enclosingFragmentationContext =
         this->enclosingFragmentationContext();
     // Not nested. We'll never need more rows than the one we already have then.
     if (!enclosingFragmentationContext)
       return;
     ASSERT(!isLayoutPagedFlowThread());
 
@@ skipping 712 matching lines @@
     const {
   return MultiColumnLayoutState(m_lastSetWorkedOn);
 }
 
 void LayoutMultiColumnFlowThread::restoreMultiColumnLayoutState(
     const MultiColumnLayoutState& state) {
   m_lastSetWorkedOn = state.columnSet();
 }
 
 }  // namespace blink