Add PageBoundaryRule parameter to fragmentainerGroupAtFlowThreadOffset().

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 to collect certain data to be used for
 // column balancing. This is an abstract class that just walks the subtree and leaves it to
 // subclasses to actually collect data.
 class ColumnBalancer {
 protected:
     ColumnBalancer(const LayoutMultiColumnSet&, LayoutUnit logicalTopInFlowThread, LayoutUnit logicalBottomInFlowThread);
 
     const LayoutMultiColumnSet& columnSet() const { return m_columnSet; }
 
     // The flow thread portion we're examining. It may be that of the entire column set, or just of
     // a fragmentainer group.
     const LayoutUnit logicalTopInFlowThread() const { return m_logicalTopInFlowThread; }
     const LayoutUnit logicalBottomInFlowThread() const { return m_logicalBottomInFlowThread; }
 
     const MultiColumnFragmentainerGroup& groupAtOffset(LayoutUnit offsetInFlowThread) const
     {
-        return m_columnSet.fragmentainerGroupAtFlowThreadOffset(offsetInFlowThread);
+        return m_columnSet.fragmentainerGroupAtFlowThreadOffset(offsetInFlowThread, LayoutBox::AssociateWithLatterPage);
     }
 
     LayoutUnit offsetFromColumnLogicalTop(LayoutUnit offsetInFlowThread) const
     {
         return offsetInFlowThread - groupAtOffset(offsetInFlowThread).columnLogicalTopForOffset(offsetInFlowThread);
     }
 
     // Flow thread offset for the layout object that we're currently examining.
     LayoutUnit flowThreadOffset() const { return m_flowThreadOffset; }
 
@@ skipping 171 matching lines @@
     LayoutUnit m_minimumSpaceShortage;
 
     // 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