ceftests: Add HSTS redirect test (see issue #3336, see issue #3348)

tests/shared/common/string_util.h

@@ -0,0 +1,23 @@
+// Copyright (c) 2022 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#ifndef CEF_TESTS_SHARED_COMMON_STRING_UTIL_H_
+#define CEF_TESTS_SHARED_COMMON_STRING_UTIL_H_
+#pragma once
+
+#include <string>
+
+namespace client {
+
+// Convert |str| to lowercase.
+std::string AsciiStrToLower(const std::string& str);
+
+// Replace all instances of |from| with |to| in |str|.
+std::string AsciiStrReplace(const std::string& str,
+                            const std::string& from,
+                            const std::string& to);
+
+}  // namespace client
+
+#endif  // CEF_TESTS_SHARED_COMMON_STRING_UTIL_H_