Handle nested theads correctly when paginated

third_party/WebKit/Source/core/paint/TableSectionPainter.cpp

Index: third_party/WebKit/Source/core/paint/TableSectionPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/TableSectionPainter.cpp b/third_party/WebKit/Source/core/paint/TableSectionPainter.cpp
index 0b22c83ee829b06ff19c1293f23facb57681e0b8..4296c815b4c87e1bd7a1ef41f91e6a1614a0f8d3 100644
--- a/third_party/WebKit/Source/core/paint/TableSectionPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/TableSectionPainter.cpp
@@ -55,10 +55,11 @@ void TableSectionPainter::paintRepeatingHeaderGroup(const PaintInfo& paintInfo,
         paginationOffset.move(0, pageHeight * static_cast<int>((paintInfo.cullRect().m_rect.y() - paginationOffset.y()) / pageHeight));
     LayoutUnit bottomBound = std::min(LayoutUnit(paintInfo.cullRect().m_rect.maxY()), paintOffset.y() + table->logicalHeight());
     while (paginationOffset.y() < bottomBound) {
+        LayoutPoint nestedOffset = paginationOffset + LayoutPoint(0, m_layoutTableSection.offsetForRepeatingHeader());
         if (itemToPaint == PaintCollapsedBorders)
-            paintCollapsedSectionBorders(paintInfo, paginationOffset, currentBorderValue);
+            paintCollapsedSectionBorders(paintInfo, nestedOffset, currentBorderValue);
         else
-            paintSection(paintInfo, paginationOffset);
+            paintSection(paintInfo, nestedOffset);
         paginationOffset.move(0, pageHeight);
     }
 }