Make WindowTree::SetModal() take the type.

ui/aura/test/mus/test_window_tree.h

 // 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.
 
 #ifndef UI_AURA_TEST_MUS_TEST_WINDOW_TREE_H_
 #define UI_AURA_TEST_MUS_TEST_WINDOW_TREE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 130 matching lines @@
       uint32_t window_id,
       mojo::InterfaceRequest<cc::mojom::MojoCompositorFrameSink> surface,
       cc::mojom::MojoCompositorFrameSinkClientPtr client) override;
   void AddWindow(uint32_t change_id, uint32_t parent, uint32_t child) override;
   void RemoveWindowFromParent(uint32_t change_id, uint32_t window_id) override;
   void AddTransientWindow(uint32_t change_id,
                           uint32_t window_id,
                           uint32_t transient_window_id) override;
   void RemoveTransientWindowFromParent(uint32_t change_id,
                                        uint32_t window_id) override;
-  void SetModal(uint32_t change_id, uint32_t window_id) override;
+  void SetModal(uint32_t change_id,
+                uint32_t window_id,
+                ui::ModalType modal_type) override;
   void ReorderWindow(uint32_t change_id,
                      uint32_t window_id,
                      uint32_t relative_window_id,
                      ui::mojom::OrderDirection direction) override;
   void GetWindowTree(uint32_t window_id,
                      const GetWindowTreeCallback& callback) override;
   void SetCapture(uint32_t change_id, uint32_t window_id) override;
   void ReleaseCapture(uint32_t change_id, uint32_t window_id) override;
   void StartPointerWatcher(bool want_moves) override;
   void StopPointerWatcher() override;
@@ skipping 57 matching lines @@
   gfx::Insets last_client_area_;
 
   base::Optional<gfx::Rect> last_hit_test_mask_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWindowTree);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_MUS_TEST_WINDOW_TREE_H_