Reland of "Use address_data.h from upstream libaddressinput".

third_party/libaddressinput/chromium/cpp/include/libaddressinput/address_metadata.h

Index: third_party/libaddressinput/chromium/cpp/include/libaddressinput/address_metadata.h
diff --git a/third_party/libaddressinput/chromium/cpp/include/libaddressinput/address_metadata.h b/third_party/libaddressinput/chromium/cpp/include/libaddressinput/address_metadata.h
new file mode 100644
index 0000000000000000000000000000000000000000..cbe72db52b395d3afbbbc40156b1d506a4b5d32a
--- /dev/null
+++ b/third_party/libaddressinput/chromium/cpp/include/libaddressinput/address_metadata.h
@@ -0,0 +1,38 @@
+// Copyright (C) 2014 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.
+
+#ifndef I18N_ADDRESSINPUT_ADDRESS_METADATA_H_
+#define I18N_ADDRESSINPUT_ADDRESS_METADATA_H_
+
+#include <libaddressinput/address_field.h>
+
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+// Checks whether |field| is a required field for |region_code|. Returns false
+// also if no data could be found for region_code. Note: COUNTRY is always
+// required.
+bool IsFieldRequired(AddressField field, const std::string& region_code);
+
+// Checks whether |field| is a field that is used for |region_code|. Returns
+// false also if no data could be found for region_code. Note: COUNTRY is always
+// used.
+bool IsFieldUsed(AddressField field, const std::string& region_code);
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_ADDRESS_METADATA_H_