Update Autofill Private API to provide a list of available countries.

chrome/browser/extensions/api/autofill_private/autofill_private_api.cc

Index: chrome/browser/extensions/api/autofill_private/autofill_private_api.cc
diff --git a/chrome/browser/extensions/api/autofill_private/autofill_private_api.cc b/chrome/browser/extensions/api/autofill_private/autofill_private_api.cc
index ce3ab6460e1c5437b1c33fd2769bf15154289f4e..c7f7da5737bea77fefef994343d44465798d2eff 100644
--- a/chrome/browser/extensions/api/autofill_private/autofill_private_api.cc
+++ b/chrome/browser/extensions/api/autofill_private/autofill_private_api.cc
@@ -279,6 +279,29 @@ ExtensionFunction::ResponseAction AutofillPrivateSaveAddressFunction::Run() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// AutofillPrivateGetCountryListFunction
+
+AutofillPrivateGetCountryListFunction::AutofillPrivateGetCountryListFunction()
+    : chrome_details_(this) {}
+
+AutofillPrivateGetCountryListFunction::
+    ~AutofillPrivateGetCountryListFunction() {}
+
+ExtensionFunction::ResponseAction
+    AutofillPrivateGetCountryListFunction::Run() {
+  autofill::PersonalDataManager* personal_data =
+      autofill::PersonalDataManagerFactory::GetForProfile(
+          chrome_details_.GetProfile());
+  DCHECK(personal_data && personal_data->IsDataLoaded());

[stevenjb, 2016/06/08 03:43:23]

Assuming data is loaded asynchronously, it would be extremely unlikely but not
strictly impossible for IsDataLoaded to be false. In that unlikely edge case I
would just return an empty list.

[hcarmona, 2016/06/08 15:05:50]

Done.

+
+  autofill_util::CountryEntryList countryList =
+      extensions::autofill_util::GenerateCountryList(*personal_data);
+
+  return RespondNow(ArgumentList(
+      api::autofill_private::GetCountryList::Results::Create(countryList)));
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // AutofillPrivateGetAddressComponentsFunction
 
 AutofillPrivateGetAddressComponentsFunction::