Index: third_party/WebKit/Source/core/paint/PaintLayer.h |
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.h b/third_party/WebKit/Source/core/paint/PaintLayer.h |
index bf0330163de5eaf2444b49d99f3ec0e0336e1455..f650fce8bcebf252a73f801d1c01ad28d43fcc56 100644 |
--- a/third_party/WebKit/Source/core/paint/PaintLayer.h |
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.h |
@@ -433,6 +433,12 @@ public: |
CompositedLayerMapping* compositedLayerMapping() const; |
GraphicsLayer* graphicsLayerBacking() const; |
GraphicsLayer* graphicsLayerBackingForScrolling() const; |
+ // Returns true for layers with scrollable overflow which have a background |
+ // that can be painted into the composited scrolling contents layer (i.e. |
+ // the background can scroll with the content). When the background is also |
+ // opaque this allows us to composite the scroller even on low DPI as we can |
+ // draw with subpixel anti-aliasing. |
+ bool shouldPaintBackgroundOntoScrollingContentsLayer() const; |
// NOTE: If you are using hasCompositedLayerMapping to determine the state of compositing for this layer, |
// (and not just to do bookkeeping related to the mapping like, say, allocating or deallocating a mapping), |
// then you may have incorrect logic. Use compositingState() instead. |