*** NOT FOR LANDING *** mapLocalToContainer and offsetFromContainer cleanup.

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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 
 #include "core/layout/LayoutMultiColumnSet.h"
 #include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
+#include "platform/geometry/TransformState.h"
 
 namespace blink {
 
 LayoutMultiColumnFlowThread::LayoutMultiColumnFlowThread()
     : m_lastSetWorkedOn(nullptr)
     , m_columnCount(1)
     , m_columnHeightAvailable(0)
     , m_inBalancingPass(false)
     , m_needsColumnHeightsRecalculation(false)
     , m_progressionIsInline(true)
@@ skipping 803 matching lines @@
     if (LayoutMultiColumnSet* lastSet = lastMultiColumnSet()) {
         ASSERT(lastSet == m_lastSetWorkedOn);
         if (!lastSet->nextSiblingMultiColumnBox()) {
             lastSet->endFlow(logicalHeight());
             lastSet->expandToEncompassFlowThreadContentsIfNeeded();
         }
     }
     m_lastSetWorkedOn = nullptr;
 }
 
+void LayoutMultiColumnFlowThread::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
+{
+    LayoutFlowThread::mapAbsoluteToLocalPoint(mode, transformState);
+
+    // Descending into a multicol flow thread. Convert to the local coordinate space, i.e. flow thread coordinates.
+    LayoutPoint visualPoint = LayoutPoint(transformState.mappedPoint());
+    transformState.move(visualPoint - visualPointToFlowThreadPoint(visualPoint));
+}
+
 void LayoutMultiColumnFlowThread::setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage)
 {
     // Only positive values are interesting (and allowed) here. Zero space shortage may be reported
     // when we're at the top of a column and the element has zero height. Ignore this, and also
     // ignore any negative values, which may occur when we set an early break in order to honor
     // widows in the next column.
     if (spaceShortage <= 0)
         return;
 
     if (LayoutMultiColumnSet* multicolSet = columnSetAtBlockOffset(offset))
@@ skipping 18 matching lines @@
 }
 
 bool LayoutMultiColumnFlowThread::isPageLogicalHeightKnown() const
 {
     if (LayoutMultiColumnSet* columnSet = lastMultiColumnSet())
         return columnSet->pageLogicalHeight();
     return false;
 }
 
 }