The column balancer needs to look inside inlines.

third_party/WebKit/Source/core/layout/ColumnBalancer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/LayoutMultiColumnSet.h"
 
 namespace blink {
 
 // A column balancer traverses a portion of the subtree of a flow thread that
 // belongs to one or more fragmentainer groups within one column set, in order
@@ skipping 72 matching lines @@
 
   // Examine and collect column balancing data for everything in the flow thread
   // portion. Will trigger calls to examineBoxAfterEntering(),
   // examineBoxBeforeLeaving() and examineLine() for interesting boxes and
   // lines.
   void traverse();
 
  private:
   void traverseSubtree(const LayoutBox&);
 
+  void traverseLines(const LayoutBlockFlow&);
+  void traverseChildren(const LayoutObject&);
+
   const LayoutMultiColumnSet& m_columnSet;
   const LayoutUnit m_logicalTopInFlowThread;
   const LayoutUnit m_logicalBottomInFlowThread;
 
   LayoutUnit m_flowThreadOffset;
 };
 
 // After an initial layout pass, we know the height of the contents of a flow
 // thread. Based on this, we can estimate an initial minimal column height. This
 // class will collect the necessary information from the layout objects to make
@@ skipping 134 matching lines @@
 
   // Set when breaking before a block, and we're looking for the first
   // unbreakable descendant, in order to report correct space shortage for that
   // one.
   LayoutUnit m_pendingStrut;
 
   unsigned m_forcedBreaksCount;
 };
 
 }  // namespace blink