Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp |
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp |
index 9fa0a8e32d6fdd95aeccbb84c1e4ee9423d139bb..fcb7fc19646cbd5a55d195b375ec71fc52a1b7d3 100644 |
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp |
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp |
@@ -2334,6 +2334,19 @@ GraphicsLayer* PaintLayer::graphicsLayerBackingForScrolling() const |
} |
} |
+bool PaintLayer::shouldPaintBackgroundOntoScrollingContentsLayer() const |
+{ |
+ // TODO(flackr): Add support for painting locally attached background images. https://crbug.com/625882 |
+ const FillLayer& backgroundLayer = layoutObject()->style()->backgroundLayers(); |
+ return !isRootLayer() |
+ && scrollsOverflow() |
+ && !backgroundLayer.image() |
+ && !backgroundLayer.next() |
+ && (backgroundLayer.attachment() == LocalBackgroundAttachment |
+ || backgroundLayer.clip() == PaddingFillBox) |
+ && !stackingNode()->hasNegativeZOrderList(); |
+} |
+ |
void PaintLayer::ensureCompositedLayerMapping() |
{ |
if (m_rareData && m_rareData->compositedLayerMapping) |