Opt out of composited scrolling with border radius.

Source/core/rendering/RenderLayerScrollableArea.cpp

Index: Source/core/rendering/RenderLayerScrollableArea.cpp
diff --git a/Source/core/rendering/RenderLayerScrollableArea.cpp b/Source/core/rendering/RenderLayerScrollableArea.cpp
index d1caf1c5b142e0f294191bb5b73165c4550aae8f..74415d38bf130bbab879566bb53c160329005e79 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -1461,7 +1461,8 @@ static bool layerNeedsCompositedScrolling(const RenderLayer* layer)
     return layer->scrollsOverflow()
         && layer->compositor()->preferCompositingToLCDTextEnabled()
         && !layer->hasDescendantWithClipPath()
-        && !layer->hasAncestorWithClipPath();
+        && !layer->hasAncestorWithClipPath()
+        && !layer->renderer()->style()->hasBorderRadius();
 }
 
 void RenderLayerScrollableArea::updateNeedsCompositedScrolling()