Refactor background painting behind table cells

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

Index: third_party/WebKit/Source/core/paint/BoxPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPainter.cpp b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
index 9742626bb99f5824eb6d33ac320f87231f88dc2c..ea5b1376faa194979809ba28401a7fdea1c10c0e 100644
--- a/third_party/WebKit/Source/core/paint/BoxPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
@@ -51,11 +51,10 @@ void BoxPainter::paintBoxDecorationBackground(const PaintInfo& paintInfo, const
     paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, paintRect);
 }
 
-LayoutRect BoxPainter::boundsForDrawingRecorder(const LayoutPoint& paintOffset)
+LayoutRect BoxPainter::boundsForDrawingRecorder(const LayoutPoint& adjustedPaintOffset)
 {
-    // Use the visual overflow rect here, because it will include overflow introduced by the theme.

[Xianzhu, 2016/05/16 21:47:53]

The comment doesn't look to make sense to me. We definitely should use
visualOverflowRect, but it's not (just) because it includes theme overflow.

     LayoutRect bounds = m_layoutBox.visualOverflowRect();
-    bounds.moveBy(paintOffset);
+    bounds.moveBy(adjustedPaintOffset);
     return bounds;
 }