Revert "Cleanup deadcode in Rendering"

Source/core/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 4477 matching lines @@
     if (!pageLogicalHeight)
         return logicalOffset;
 
     // The logicalOffset is in our coordinate space.  We can add in our pushed offset.
     LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(logicalOffset);
     if (pageBoundaryRule == ExcludePageBoundary)
         return logicalOffset + (remainingLogicalHeight ? remainingLogicalHeight : pageLogicalHeight);
     return logicalOffset + remainingLogicalHeight;
 }
 
+LayoutUnit RenderBlock::pageLogicalTopForOffset(LayoutUnit offset) const
+{
+    RenderView* renderView = view();
+    LayoutUnit firstPageLogicalTop = isHorizontalWritingMode() ? renderView->layoutState()->pageOffset().height() : renderView->layoutState()->pageOffset().width();
+    LayoutUnit blockLogicalTop = isHorizontalWritingMode() ? renderView->layoutState()->layoutOffset().height() : renderView->layoutState()->layoutOffset().width();
+
+    LayoutUnit cumulativeOffset = offset + blockLogicalTop;
+    RenderFlowThread* flowThread = flowThreadContainingBlock();
+    if (!flowThread) {
+        LayoutUnit pageLogicalHeight = renderView->layoutState()->pageLogicalHeight();
+        if (!pageLogicalHeight)
+            return 0;
+        return cumulativeOffset - roundToInt(cumulativeOffset - firstPageLogicalTop) % roundToInt(pageLogicalHeight);
+    }
+    return flowThread->pageLogicalTopForOffset(cumulativeOffset);
+}
+
 LayoutUnit RenderBlock::pageLogicalHeightForOffset(LayoutUnit offset) const
 {
     RenderView* renderView = view();
     RenderFlowThread* flowThread = flowThreadContainingBlock();
     if (!flowThread)
         return renderView->layoutState()->pageLogicalHeight();
     return flowThread->pageLogicalHeightForOffset(offset + offsetFromLogicalTopOfFirstPage());
 }
 
 LayoutUnit RenderBlock::pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule pageBoundaryRule) const
@@ skipping 308 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink