Fix table cell background painting

third_party/WebKit/Source/core/paint/TableCellPainter.h

Index: third_party/WebKit/Source/core/paint/TableCellPainter.h
diff --git a/third_party/WebKit/Source/core/paint/TableCellPainter.h b/third_party/WebKit/Source/core/paint/TableCellPainter.h
index e195120e90fcc1008955e2c58dbd3bd91fb386a6..b6211e9ac391a714a304996562aa194027ea45c4 100644
--- a/third_party/WebKit/Source/core/paint/TableCellPainter.h
+++ b/third_party/WebKit/Source/core/paint/TableCellPainter.h
@@ -13,6 +13,7 @@ namespace blink {
 
 struct PaintInfo;
 class CollapsedBorderValue;
+class LayoutBox;
 class LayoutPoint;
 class LayoutRect;
 class LayoutTableCell;
@@ -27,7 +28,7 @@ public:
     void paint(const PaintInfo&, const LayoutPoint&);
 
     void paintCollapsedBorders(const PaintInfo&, const LayoutPoint&, const CollapsedBorderValue&);
-    void paintBackgroundsBehindCell(const PaintInfo&, const LayoutPoint&, const LayoutObject* backgroundObject, DisplayItem::Type);
+    void paintBackgroundsBehindCell(const PaintInfo&, const LayoutPoint&, const LayoutBox* backgroundObject, DisplayItem::Type);
     void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint& paintOffset);
     void paintMask(const PaintInfo&, const LayoutPoint& paintOffset);
 
@@ -36,6 +37,11 @@ public:
     // to its parent.
     LayoutRect paintBounds(const LayoutPoint& paintOffset, PaintBoundOffsetBehavior);
 
+    void paintParentBackgroundsBehindCell(const PaintInfo&, const LayoutPoint&, const LayoutBox* backgroundObject, DisplayItem::Type);

[Xianzhu, 2016/03/28 00:44:43]

1. Make it private.
2. backgroundObject should be 'const LayoutBox&' because it is never null. You
can update paintBackgroundsBehindCell also accept 'const LayoutBox&' or leave it
until you remove the RuntimeEnabledFeature.

[atotic1, 2016/03/29 17:05:17]

Done. Modified the old routine to accept const LayoutBox& too.

+
+    // Computed bounds for parent background objects.
+    LayoutRect paintBoundsParent(const LayoutPoint& paintOffset, const LayoutBox*, DisplayItem::Type);

[Xianzhu, 2016/03/28 00:44:43]

Make it private.

[atotic1, 2016/03/29 17:05:17]

Done.

+
 private:
     const CollapsedBorderValue* cachedCollapsedLeftBorder(const ComputedStyle&) const;
     const CollapsedBorderValue* cachedCollapsedRightBorder(const ComputedStyle&) const;