Revert "Cleanup deadcode in Rendering"

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 8b659c6fc1102bb84deed818f02f858726598aa2..7a4db09eda33c4fdc5d87bc6e6582270b9c086ae 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -4495,6 +4495,23 @@ LayoutUnit RenderBlock::nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundar
     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();