Prepare height calculation methods in LayoutFlowThread for nested multicol.

Source/core/layout/LayoutPagedFlowThread.cpp

 // Copyright 2014 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 "config.h"
 #include "core/layout/LayoutPagedFlowThread.h"
 
 #include "core/layout/LayoutMultiColumnSet.h"
 
 namespace blink {
@@ skipping 28 matching lines @@
 
 void LayoutPagedFlowThread::layout()
 {
     ASSERT(firstMultiColumnBox() == lastMultiColumnBox()); // There should either be zero or one of those for paged layout.
     setProgressionIsInline(pagedBlockFlow()->style()->hasInlinePaginationAxis());
     LayoutMultiColumnFlowThread::layout();
 
     LayoutMultiColumnSet* columnSet = firstMultiColumnSet();
     if (!columnSet)
         return;
-    LayoutUnit pageLogicalHeight = columnSet->pageLogicalHeight();
+    LayoutUnit pageLogicalHeight = columnSet->pageLogicalHeightForOffset(LayoutUnit());
     if (!pageLogicalHeight)
         return; // Page height not calculated yet. Happens in the first layout pass when height is auto.
     // Ensure uniform page height. We don't want the last page to be shorter than the others,
     // or it'll be impossible to scroll that whole page into view.
     LayoutUnit paddedLogicalBottomInFlowThread = pageLogicalHeight * pageCount();
     ASSERT(paddedLogicalBottomInFlowThread >= columnSet->logicalBottomInFlowThread());
     columnSet->endFlow(paddedLogicalBottomInFlowThread);
 }
 
 } // namespace blink