Compute and include the offset of the sticky box to its enclosing composited layer.

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 77c45e696e4ac061597a8addbaf2b0acacdaf212..1b005c8877f52a52642d05f65ce2ef2ae54a8f3c 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -585,7 +585,7 @@ void Layer::SetPosition(const gfx::PointF& position) {
               transform_tree_index());
       sticky_data->main_thread_offset =
           position.OffsetFromOrigin() -
-          sticky_data->constraints.scroll_container_relative_sticky_box_rect
+          sticky_data->constraints.parent_relative_sticky_box_offset
               .OffsetFromOrigin();
     }
     transform_node->needs_local_transform_update = true;