Make extensions DSE persistent in browser prefs

components/search_engines/search_engines_test_util.h

+// Copyright 2016 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.
+
+#ifndef COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINES_TEST_UTIL_H_
+#define COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINES_TEST_UTIL_H_
+
+#include <string>
+
+struct TemplateURLData;
+
+// Generate TemplateUrlData structure useful for tests filled with values
+// autogenerated from provider_name param.
+std::unique_ptr<TemplateURLData> GenerateDummyTemplateURLData(
+    const std::string& provider_name);
+
+// Checks that the two TemplateURLs are similar. Does not check the id, the
+// date_created or the last_modified time.  Neither pointer should be nullptr.
+void ExpectSimilar(const TemplateURLData* expected,
+                   const TemplateURLData* actual);
+
+#endif  // COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINES_TEST_UTIL_H_