Fix visual rect for background box painting in composited scrollers.

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 15c4f102bfa1a638d8c264b848300c684fbaba0b..b6612b49a3b5fdcef6f958668968f9535e676054 100644
--- a/third_party/WebKit/Source/core/paint/BoxPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
@@ -109,11 +109,11 @@ void BoxPainter::paintBoxDecorationBackgroundWithRect(const PaintInfo& paintInfo
     if (style.appearance() == MediaSliderPart)
         cacheSkipper.emplace(paintInfo.context);
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, DisplayItem::BoxDecorationBackground))
+    const DisplayItemClient& displayItemClient = paintingOverflowContents ? static_cast<const DisplayItemClient&>(*m_layoutBox.layer()->compositedLayerMapping()->scrollingContentsLayer()) : m_layoutBox;
+    if (DrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, displayItemClient, DisplayItem::BoxDecorationBackground))
         return;
 
-    LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutBox, DisplayItem::BoxDecorationBackground, boundsForDrawingRecorder(paintInfo, paintOffset));
-
+    DrawingRecorder recorder(paintInfo.context, displayItemClient, DisplayItem::BoxDecorationBackground, FloatRect(boundsForDrawingRecorder(paintInfo, paintOffset)));
     BoxDecorationData boxDecorationData(m_layoutBox);
     GraphicsContextStateSaver stateSaver(paintInfo.context, false);