Adds WindowManagerManager to mus

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 53 matching lines @@
   return true;
 }
 
 bool WindowManagerAccessPolicy::CanEmbed(const ServerWindow* window,
                                          uint32_t policy_bitmask) const {
   return !delegate_->HasRootForAccessPolicy(window);
 }
 
 bool WindowManagerAccessPolicy::CanChangeWindowVisibility(
     const ServerWindow* window) const {
-  // The WindowManager can change the visibility of the root too.
-  return window->id().connection_id == connection_id_ ||
-         (window->GetRoot() == window);
+  if (window->id().connection_id == connection_id_)
+    return true;
+  // The WindowManager can change the visibility of the WindowManager root.
+  const ServerWindow* root = window->GetRoot();
+  return root && window->parent() == root;
 }
 
 bool WindowManagerAccessPolicy::CanSetWindowSurface(
     const ServerWindow* window,
     mus::mojom::SurfaceType surface_type) const {
   if (surface_type == mojom::SurfaceType::UNDERLAY)
     return window->id().connection_id == connection_id_;
 
   if (delegate_->IsWindowRootOfAnotherConnectionForAccessPolicy(window))
     return false;
@@ skipping 59 matching lines @@
 }
 
 bool WindowManagerAccessPolicy::IsWindowKnown(
     const ServerWindow* window) const {
   return delegate_->IsWindowKnownForAccessPolicy(window);
 }
 
 }  // namespace ws
 
 }  // namespace mus