mus: Server-side implementation of modal windows

components/mus/ws/default_access_policy.h

 // 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.
 
 #ifndef COMPONENTS_MUS_WS_DEFAULT_ACCESS_POLICY_H_
 #define COMPONENTS_MUS_WS_DEFAULT_ACCESS_POLICY_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 13 matching lines @@
   ~DefaultAccessPolicy() override;
 
   // AccessPolicy:
   bool CanRemoveWindowFromParent(const ServerWindow* window) const override;
   bool CanAddWindow(const ServerWindow* parent,
                     const ServerWindow* child) const override;
   bool CanAddTransientWindow(const ServerWindow* parent,
                              const ServerWindow* child) const override;
   bool CanRemoveTransientWindowFromParent(
       const ServerWindow* window) const override;
+  bool CanSetModal(const ServerWindow* window) const override;
   bool CanReorderWindow(const ServerWindow* window,
                         const ServerWindow* relative_window,
                         mojom::OrderDirection direction) const override;
   bool CanDeleteWindow(const ServerWindow* window) const override;
   bool CanGetWindowTree(const ServerWindow* window) const override;
   bool CanDescendIntoWindowForWindowTree(
       const ServerWindow* window) const override;
   bool CanEmbed(const ServerWindow* window,
                 uint32_t policy_bitmask) const override;
   bool CanChangeWindowVisibility(const ServerWindow* window) const override;
@@ skipping 22 matching lines @@
   AccessPolicyDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultAccessPolicy);
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_DEFAULT_ACCESS_POLICY_H_