mus: Server-side implementation of modal windows

components/mus/ws/window_manager_access_policy.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 "components/mus/ws/window_manager_access_policy.h"
 
 #include "components/mus/ws/access_policy_delegate.h"
 #include "components/mus/ws/server_window.h"
 
 namespace mus {
@@ skipping 24 matching lines @@
     const ServerWindow* parent,
     const ServerWindow* child) const {
   return true;
 }
 
 bool WindowManagerAccessPolicy::CanRemoveTransientWindowFromParent(
     const ServerWindow* window) const {
   return true;
 }
 
+bool WindowManagerAccessPolicy::CanSetAsModal(
+    const ServerWindow* window) const {
+  return true;
+}
+
 bool WindowManagerAccessPolicy::CanReorderWindow(
     const ServerWindow* window,
     const ServerWindow* relative_window,
     mojom::OrderDirection direction) const {
   return true;
 }
 
 bool WindowManagerAccessPolicy::CanDeleteWindow(
     const ServerWindow* window) const {
   return window->id().connection_id == connection_id_;
@@ skipping 91 matching lines @@
 }
 
 bool WindowManagerAccessPolicy::IsWindowKnown(
     const ServerWindow* window) const {
   return delegate_->IsWindowKnownForAccessPolicy(window);
 }
 
 }  // namespace ws
 
 }  // namespace mus