Validate incoming window properties.

ash/public/cpp/shelf_types.cc

+// Copyright 2017 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 "ash/public/cpp/shelf_types.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+
+namespace ash {
+
+namespace {
+
+bool DoValidateShelfItemType(int32_t i) {
+  return i == TYPE_APP_PANEL || i == TYPE_APP_SHORTCUT || i == TYPE_APP_LIST ||
+         i == TYPE_BROWSER_SHORTCUT || i == TYPE_APP || i == TYPE_DIALOG ||
+         i == TYPE_UNDEFINED;
+}
+
+}  // namespace
+
+base::RepeatingCallback<bool(int32_t)> ValidateShelfItemType() {
+  return base::Bind(&DoValidateShelfItemType);
+}
+
+}  // namespace ash