[rac] Temporarily copy libaddressinput to Chrome.

third_party/libaddressinput/chromium/cpp/src/lookup_key_util.cc

+// Copyright (C) 2013 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "lookup_key_util.h"
+
+#include <cassert>
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+LookupKeyUtil::LookupKeyUtil(const std::string& validation_data_url)
+    : validation_data_url_(validation_data_url) {
+  assert(validation_data_url_.length() > 0);
+  assert(validation_data_url_[validation_data_url_.length() - 1] == '/');
+}
+
+LookupKeyUtil::~LookupKeyUtil() {}
+
+std::string LookupKeyUtil::GetUrlForKey(const std::string& key) const {
+  return validation_data_url_ + key;
+}
+
+std::string LookupKeyUtil::GetKeyForUrl(const std::string& url) const {
+  return IsValidationDataUrl(url) ? url.substr(validation_data_url_.length())
+                                  : std::string();
+}
+
+bool LookupKeyUtil::IsValidationDataUrl(const std::string& url) const {
+  return
+      url.compare(0, validation_data_url_.length(), validation_data_url_) == 0;
+}
+
+}  // namespace addressinput
+}  // namespace i18n