Fixes bug in handling restacking because of transients

ui/aura/test/mus/test_window_tree.cc

 // Copyright 2015 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.
 
 #include "ui/aura/test/mus/test_window_tree.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace aura {
 
@@ skipping 180 matching lines @@
 }
 
 void TestWindowTree::SetModal(uint32_t change_id, uint32_t window_id) {
   OnChangeReceived(change_id, WindowTreeChangeType::MODAL);
 }
 
 void TestWindowTree::ReorderWindow(uint32_t change_id,
                                    uint32_t window_id,
                                    uint32_t relative_window_id,
                                    ui::mojom::OrderDirection direction) {
-  OnChangeReceived(change_id);
+  OnChangeReceived(change_id, WindowTreeChangeType::REORDER);
 }
 
 void TestWindowTree::GetWindowTree(uint32_t window_id,
                                    const GetWindowTreeCallback& callback) {}
 
 void TestWindowTree::SetCapture(uint32_t change_id, uint32_t window_id) {
   OnChangeReceived(change_id, WindowTreeChangeType::CAPTURE);
 }
 
 void TestWindowTree::ReleaseCapture(uint32_t change_id, uint32_t window_id) {
@@ skipping 59 matching lines @@
 void TestWindowTree::PerformWindowMove(uint32_t change_id,
                                        uint32_t window_id,
                                        ui::mojom::MoveLoopSource source,
                                        const gfx::Point& cursor_location) {
   OnChangeReceived(change_id);
 }
 
 void TestWindowTree::CancelWindowMove(uint32_t window_id) {}
 
 }  // namespace aura