Autofill card unmasking prompt - Make "verifying..." message an overlay

ui/views/layout/fill_layout.h

Index: ui/views/layout/fill_layout.h
diff --git a/ui/views/layout/fill_layout.h b/ui/views/layout/fill_layout.h
index 412fc53e227ab6ead2c4dd3c9801b9020e1d301d..3f1e1585e4ae8853b9b5fa1e43a9f4c7971e92fd 100644
--- a/ui/views/layout/fill_layout.h
+++ b/ui/views/layout/fill_layout.h
@@ -14,8 +14,9 @@ namespace views {
 ///////////////////////////////////////////////////////////////////////////////
 //
 // FillLayout
-//  A simple LayoutManager that causes the associated view's one child to be
-//  sized to match the bounds of its parent.
+//  A simple LayoutManager that causes the associated view's children to be
+//  sized to match the bounds of its parent. Multiple children are allowed,
+//  but only the first child will have any bearing on the preferred size.
 //
 ///////////////////////////////////////////////////////////////////////////////
 class VIEWS_EXPORT FillLayout : public LayoutManager {