mus: Server-side implementation of modal windows

components/mus/ws/default_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/default_access_policy.h"
 
 #include "components/mus/ws/access_policy_delegate.h"
 #include "components/mus/ws/server_window.h"
 
 namespace mus {
@@ skipping 33 matching lines @@
 }
 
 bool DefaultAccessPolicy::CanRemoveTransientWindowFromParent(
     const ServerWindow* window) const {
   return (delegate_->HasRootForAccessPolicy(window) ||
           WasCreatedByThisConnection(window)) &&
          (delegate_->HasRootForAccessPolicy(window->transient_parent()) ||
           WasCreatedByThisConnection(window->transient_parent()));
 }
 
+bool DefaultAccessPolicy::CanSetModal(const ServerWindow* window) const {
+  return delegate_->HasRootForAccessPolicy(window) ||
+         WasCreatedByThisConnection(window);
+}
+
 bool DefaultAccessPolicy::CanReorderWindow(
     const ServerWindow* window,
     const ServerWindow* relative_window,
     mojom::OrderDirection direction) const {
   return WasCreatedByThisConnection(window) &&
          WasCreatedByThisConnection(relative_window);
 }
 
 bool DefaultAccessPolicy::CanDeleteWindow(const ServerWindow* window) const {
   return WasCreatedByThisConnection(window);
@@ skipping 122 matching lines @@
 }
 
 bool DefaultAccessPolicy::IsDescendantOfEmbedRoot(
     const ServerWindow* window) const {
   return delegate_->IsDescendantOfEmbedRoot(window);
 }
 
 }  // namespace ws
 
 }  // namespace mus