Handle exclusive end offsets when translating from flow thread coordinates.

third_party/WebKit/Source/core/layout/LayoutMultiColumnSet.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 271 matching lines @@
         if (LayoutBox* next = nextSiblingBox()) {
             if (next->isLayoutMultiColumnSpannerPlaceholder()) {
                 // If we're followed by a spanner, we need to balance.
                 return true;
             }
         }
     }
     return !flowThread->columnHeightAvailable();
 }
 
-LayoutSize LayoutMultiColumnSet::flowThreadTranslationAtOffset(LayoutUnit blockOffset, CoordinateSpaceConversion mode) const
+LayoutSize LayoutMultiColumnSet::flowThreadTranslationAtOffset(LayoutUnit blockOffset, PageBoundaryRule rule, CoordinateSpaceConversion mode) const
 {
-    return fragmentainerGroupAtFlowThreadOffset(blockOffset).flowThreadTranslationAtOffset(blockOffset, mode);
+    return fragmentainerGroupAtFlowThreadOffset(blockOffset).flowThreadTranslationAtOffset(blockOffset, rule, mode);
 }
 
 LayoutPoint LayoutMultiColumnSet::visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const
 {
     const MultiColumnFragmentainerGroup& row = fragmentainerGroupAtVisualPoint(visualPoint);
     return row.visualPointToFlowThreadPoint(visualPoint - row.offsetFromColumnSet());
 }
 
 LayoutUnit LayoutMultiColumnSet::pageLogicalTopForOffset(LayoutUnit offset) const
 {
@@ skipping 230 matching lines @@
     // Now add in column rule bounds, if present.
     Vector<LayoutRect> columnRuleBounds;
     if (computeColumnRuleBounds(LayoutPoint(), columnRuleBounds)) {
         for (auto& bound : columnRuleBounds)
             blockFlowBounds.unite(bound);
     }
     return blockFlowBounds;
 }
 
 } // namespace blink