REGRESSION (r183300): Fixed elements flash when scrolling

[WebKit-https.git] / Source / WebCore / rendering / RenderLayerBacking.cpp

diff --git a/Source/WebCore/rendering/RenderLayerBacking.cpp b/Source/WebCore/rendering/RenderLayerBacking.cpp
index 7a45d2a6c8058f69f1b5252e7531fcd64a58540b..afd5f35d053b4e796a2eeab0176699501421a198 100644 (file)
--- a/Source/WebCore/rendering/RenderLayerBacking.cpp
+++ b/Source/WebCore/rendering/RenderLayerBacking.cpp
@@ -1569,6 +1569,11 @@ void RenderLayerBacking::detachFromScrollingCoordinator(LayerScrollCoordinationR
     }
 }
 
+void RenderLayerBacking::setIsScrollCoordinatedWithViewportConstrainedRole(bool viewportCoordinated)
+{
+    m_graphicsLayer->setAllowsBackingStoreDetachment(!viewportCoordinated);
+}
+
 GraphicsLayerPaintingPhase RenderLayerBacking::paintingPhaseForPrimaryLayer() const
 {
     unsigned phase = 0;