Add system modals to the proper container in mus+ash.

services/ui/ws/window_manager_client_unittest.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 36 matching lines @@
   void SetWindowManagerClient(aura::WindowManagerClient* client) override {}
   bool OnWmSetBounds(aura::Window* window, gfx::Rect* bounds) override {
     return false;
   }
   bool OnWmSetProperty(
       aura::Window* window,
       const std::string& name,
       std::unique_ptr<std::vector<uint8_t>>* new_data) override {
     return false;
   }
+  void OnWmSetModalType(aura::Window* window, ui::ModalType type) override {}
   void OnWmSetCanFocus(aura::Window* window, bool can_focus) override {}
   aura::Window* OnWmCreateTopLevelWindow(
       ui::mojom::WindowType window_type,
       std::map<std::string, std::vector<uint8_t>>* properties) override {
     return nullptr;
   }
   void OnWmClientJankinessChanged(const std::set<aura::Window*>& client_windows,
                                   bool not_responding) override {}
   void OnWmWillCreateDisplay(const display::Display& display) override {}
   void OnWmNewDisplay(std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
@@ skipping 701 matching lines @@
   ASSERT_EQ(1u, top_level_in_wm->children().size());
   aura::Window* second_client_child_in_wm = top_level_in_wm->children()[0];
   ASSERT_EQ(1u, second_client_child_in_wm->children().size());
   aura::Window* transient_in_wm = second_client_child_in_wm->children()[0];
   ASSERT_EQ(second_client_child_in_wm,
             transient_window_client->GetTransientParent(transient_in_wm));
 }
 
 }  // namespace ws
 }  // namespace ui