Add PageBoundaryRule parameter to columnSetAtBlockOffset().

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

 /*
  * 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 181 matching lines @@
     bool isPageLogicalHeightKnown() const final;
 
     LayoutSize flowThreadTranslationAtOffset(LayoutUnit, PageBoundaryRule, CoordinateSpaceConversion) const;
     LayoutSize flowThreadTranslationAtPoint(const LayoutPoint& flowThreadPoint, CoordinateSpaceConversion) const;
 
     LayoutPoint flowThreadPointToVisualPoint(const LayoutPoint& flowThreadPoint) const override;
     LayoutPoint visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const override;
 
     int inlineBlockBaseline(LineDirectionMode) const override;
 
-    LayoutMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const final;
+    LayoutMultiColumnSet* columnSetAtBlockOffset(LayoutUnit, PageBoundaryRule) const final;
 
     void layoutColumns(SubtreeLayoutScope&);
 
     // Skip past a column spanner during flow thread layout. Spanners are not laid out inside the
     // flow thread, since the flow thread is not in a spanner's containing block chain (since the
     // containing block is the multicol container).
     void skipColumnSpanner(LayoutBox*, LayoutUnit logicalTopInFlowThread);
 
     // Returns true if at least one column got a new height after flow thread layout (during column
     // set layout), in which case we need another layout pass. Column heights may change after flow
@@ skipping 70 matching lines @@
     bool m_isBeingEvacuated;
 };
 
 // Cannot use DEFINE_LAYOUT_OBJECT_TYPE_CASTS here, because isMultiColumnFlowThread() is defined in
 // LayoutFlowThread, not in LayoutObject.
 DEFINE_TYPE_CASTS(LayoutMultiColumnFlowThread, LayoutFlowThread, object, object->isLayoutMultiColumnFlowThread(), object.isLayoutMultiColumnFlowThread());
 
 } // namespace blink
 
 #endif // LayoutMultiColumnFlowThread_h