Pass integer scroll position to CC if frameView has non-layered viewport constrained objects

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index 80bbf1b9c1caa164c41519188afb2ff8c9b8d76d..c22e19f8bfb14fb892ebb6f639e6a977459a7f07 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -1268,6 +1268,22 @@ LayoutRect FrameView::viewportConstrainedVisibleContentRect() const
     return viewportRect;
 }
 
+bool FrameView::hasVisibleViewportConstrainedObjects() const
+{
+    const ViewportConstrainedObjectSet* objects = viewportConstrainedObjects();
+    if (!objects)
+        return false;
+    for (const RenderObject* renderer : *objects) {
+        RenderLayer* layer = toRenderBoxModelObject(renderer)->layer();
+        if (layer) {
+            layer->updateDescendantDependentFlags();
+            if (!layer->subtreeIsInvisible())
+                return true;
+        }
+    }
+    return false;
+}
+
 void FrameView::viewportConstrainedVisibleContentSizeChanged(bool widthChanged, bool heightChanged)
 {
     if (!hasViewportConstrainedObjects())