Support the ignored_by_shelf flag for Mus windows.

mash/wm/property_util.cc

 // 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.
 
 #include "mash/wm/property_util.h"
 
 #include <stdint.h>
 
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window_property.h"
@@ skipping 144 matching lines @@
 }
 
 base::string16 GetAppID(const mus::Window* window) {
   if (!window->HasSharedProperty(mus::mojom::WindowManager::kAppID_Property))
     return base::string16();
 
   return window->GetSharedProperty<base::string16>(
       mus::mojom::WindowManager::kAppID_Property);
 }
 
+bool GetWindowIgnoredByShelf(mus::Window* window) {
+  return window->HasSharedProperty(
+             mus::mojom::WindowManager::kWindowIgnoredByShelf_Property) &&
+         window->GetSharedProperty<bool>(
+             mus::mojom::WindowManager::kWindowIgnoredByShelf_Property);
+}
+
 }  // namespace wm
 }  // namespace mash