getClientRects() shouldn't clip against any ancestors.

third_party/WebKit/Source/core/layout/FragmentainerIterator.cpp

 // Copyright 2016 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/FragmentainerIterator.h"
 
 #include "core/layout/LayoutMultiColumnSet.h"
 
 namespace blink {
 
@@ skipping 59 matching lines @@
   DCHECK(!atEnd());
   const MultiColumnFragmentainerGroup& group = currentGroup();
   LayoutUnit fragmentainerLogicalTopInFlowThread =
       group.logicalTopInFlowThread() +
       m_currentFragmentainerIndex * group.logicalHeight();
   return group.flowThreadTranslationAtOffset(
       fragmentainerLogicalTopInFlowThread, LayoutBox::AssociateWithLatterPage,
       CoordinateSpaceConversion::Visual);
 }
 
-LayoutRect FragmentainerIterator::fragmentainerInFlowThread() const {
-  DCHECK(!atEnd());
-  LayoutRect fragmentainerInFlowThread =
-      currentGroup().flowThreadPortionRectAt(m_currentFragmentainerIndex);
-  m_flowThread.flipForWritingMode(fragmentainerInFlowThread);
-  return fragmentainerInFlowThread;
-}
-
-LayoutRect FragmentainerIterator::clipRectInFlowThread() const {
+LayoutRect FragmentainerIterator::clipRectInFlowThread(
+    MultiColumnFragmentainerGroup::ClipRectAxesSelector axesSelector) const {
   DCHECK(!atEnd());
   LayoutRect clipRect = currentGroup().flowThreadPortionOverflowRectAt(
-      m_currentFragmentainerIndex);
+      m_currentFragmentainerIndex, axesSelector);
   m_flowThread.flipForWritingMode(clipRect);
   return clipRect;
 }
 
 const MultiColumnFragmentainerGroup& FragmentainerIterator::currentGroup()
     const {
   DCHECK(!atEnd());
   return m_currentColumnSet
       ->fragmentainerGroups()[m_currentFragmentainerGroupIndex];
 }
@@ skipping 52 matching lines @@
     if (m_currentFragmentainerIndex < firstFragmentainerInClipRect)
       m_currentFragmentainerIndex = firstFragmentainerInClipRect;
     if (m_endFragmentainerIndex > lastFragmentainerInClipRect)
       m_endFragmentainerIndex = lastFragmentainerInClipRect;
   }
   DCHECK(m_endFragmentainerIndex >= m_currentFragmentainerIndex);
   return true;
 }
 
 }  // namespace blink