[rac] Download all rules for a country code in libaddressinput.

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

Index: third_party/libaddressinput/chromium/cpp/src/rule.cc
diff --git a/third_party/libaddressinput/chromium/cpp/src/rule.cc b/third_party/libaddressinput/chromium/cpp/src/rule.cc
index 15d13443de680420e50729ae32a8ad90096dd443..a8aba1d8101c63c72ae133dbfaa8e1b0b02599cf 100644
--- a/third_party/libaddressinput/chromium/cpp/src/rule.cc
+++ b/third_party/libaddressinput/chromium/cpp/src/rule.cc
@@ -24,6 +24,7 @@
 #include "address_field_util.h"
 #include "grit.h"
 #include "messages.h"
+#include "region_data_constants.h"
 #include "util/json.h"
 #include "util/string_split.h"
 
@@ -98,6 +99,15 @@ int GetMessageIdFromName(const std::string& name,
   return it != message_ids.end() ? it->second : INVALID_MESSAGE_ID;
 }
 
+// Parses the default region data into the static Rule object and returns a
+// constant reference to this object. Cannot return a copy of the object,
+// because Rule objects are not copyable.
+const Rule& InitDefaultRule() {
+  static Rule rule;
+  rule.ParseSerializedRule(RegionDataConstants::GetDefaultRegionData());
+  return rule;
+}
+
 }  // namespace
 
 Rule::Rule()
@@ -110,6 +120,16 @@ Rule::Rule()
 
 Rule::~Rule() {}
 
+// static
+const Rule& Rule::GetDefault() {
+  // Returns the constant reference to the Rule object from InitDefaultRule().
+  // The static object is in InitDefaultRule(), but this function maintains a
+  // constant static reference to it. The constant static reference avoids
+  // re-parsing the default region data.
+  static const Rule& kDefaultRule(InitDefaultRule());
+  return kDefaultRule;
+}
+
 void Rule::CopyFrom(const Rule& rule) {
   format_ = rule.format_;
   sub_keys_ = rule.sub_keys_;