Some security checks around destruction/setting bounds.

mojo/services/public/interfaces/view_manager/view_manager.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import "../../../../public/interfaces/geometry/geometry.mojom"
 
 module mojo.view_manager {
 
 struct INode {
   uint32 parent_id;
   uint32 node_id;
   uint32 view_id;
+  mojo.Rect bounds;
 };
 
 // Functions that mutate the hierarchy take a change id. This is an ever
 // increasing integer used to identify the change. Every hierarchy change
 // increases this value. The server only accepts changes where the supplied
 // |server_change_id| matches the expected next value. This ensures changes are
 // made in a well defined order.
 //
 // Nodes and Views are identified by a uint32. The upper 16 bits are the
 // connection id, and the lower 16 the id assigned by the client.
@@ skipping 110 matching lines @@
 
   // Invoked when the view associated with a node is replaced by another view.
   // 0 is used to identify a null view.
   OnNodeViewReplaced(uint32 node, uint32 new_view_id, uint32 old_view_id);
 
   // Invoked when a view is deleted.
   OnViewDeleted(uint32 view);
 };
 
 }