Generate a static struct from fieldtrial_testing_config

tools/variations/unittest_data/expected_output.h

+// Copyright 2015 The Chromium Authors. All rights reserved.

[Alexei Svitkine (slow), 2015/07/09 19:48:27]

This test will fail in 2016, since the year seems to be dynamically generated by
the script.

Please fix it so that this doesn't happen, either by:
  - Omitting this header comment in the expected files and checking Contains()
instead of Equals().
  - Or substituting the year string with a placeholder.

Or something else along those lines.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// GENERATED FROM THE SCHEMA DEFINITION AND DESCRIPTION IN
+//   fieldtrial_testing_config_schema.json
+//   test_config.json
+// DO NOT EDIT.
+
+#ifndef TEST_OUPUT_H_
+#define TEST_OUPUT_H_
+
+#include <cstddef>
+
+
+struct FieldTrialGroupParams {
+  const char* const key;
+  const char* const value;
+};
+
+struct FieldTrialTestingGroup {
+  const char* const study;
+  const char* const group_name;
+  const FieldTrialGroupParams * params;
+  const size_t params_size;
+};
+
+struct FieldTrialTestingConfig {
+  const FieldTrialTestingGroup * groups;
+  const size_t groups_size;
+};
+
+
+extern const FieldTrialTestingConfig kFieldTrialConfig;
+
+#endif  // TEST_OUPUT_H_