Switch Safe Browsing's metadata from string to struct.

components/safe_browsing_db/testing_util.h

Index: components/safe_browsing_db/testing_util.h
diff --git a/components/safe_browsing_db/testing_util.h b/components/safe_browsing_db/testing_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..003051896055b77a26b2292d75082a8572eb6614
--- /dev/null
+++ b/components/safe_browsing_db/testing_util.h
@@ -0,0 +1,38 @@
+// Copyright (c) 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.
+//
+// Utilities to be used in tests of safe_browsing_db/ component.
+
+#ifndef COMPONENTS_SAFE_BROWSING_DB_TESTING_UTIL_H_
+#define COMPONENTS_SAFE_BROWSING_DB_TESTING_UTIL_H_
+
+#include "components/safe_browsing_db/util.h"
+
+#include <ostream>
+
+namespace safe_browsing {
+
+inline bool operator==(const ThreatMetadata& lhs, const ThreatMetadata& rhs) {
+  return lhs.threat_pattern_type == rhs.threat_pattern_type &&
+         lhs.api_permissions == rhs.api_permissions &&
+         lhs.population_id == rhs.population_id &&
+         lhs.raw_metadata == rhs.raw_metadata;
+}
+
+inline bool operator!=(const ThreatMetadata& lhs, const ThreatMetadata& rhs) {
+  return !(lhs == rhs);
+}
+
+inline std::ostream& operator<<(std::ostream& os, const ThreatMetadata& meta) {
+  os << "{threat_pattern_type=" << static_cast<int>(meta.threat_pattern_type)
+     << ", api_permissions=[";
+  for (auto p : meta.api_permissions)
+    os << p << ",";
+  return os << "], population_id=" << meta.population_id
+            << ", raw_metadata=" << meta.raw_metadata << "}";
+}
+
+}  // namespace safe_browsing
+
+#endif  // COMPONENTS_SAFE_BROWSING_DB_TESTING_UTIL_H_