Use high resolution markers when device scale factor > 1.5f

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index dcb8112eeaa0b9120b9f5efdfedf6fe352224a9a..8c9eaaef0e2af304f291e0d0bae50a5e43182224 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -3618,6 +3618,9 @@ void RenderLayer::paintLayerContents(GraphicsContext* context, const LayerPainti
         || (!isPaintingScrollingContent && isPaintingCompositedForeground));
     bool shouldPaintContent = m_hasVisibleContent && isSelfPaintingLayer && !isPaintingOverlayScrollbars;
 
+    float deviceScaleFactor = WebCore::deviceScaleFactor(renderer()->frame());
+    context->setUseHighResMarkers(deviceScaleFactor > 1.5f);
+
     GraphicsContext* transparencyLayerContext = context;
     
     if (localPaintFlags & PaintLayerPaintingRootBackgroundOnly && !renderer()->isRenderView() && !renderer()->isRoot())