[Payment Request] Formats phone number and credit card number in editors.

components/payments/core/payment_request_data_util.cc

Index: components/payments/core/payment_request_data_util.cc
diff --git a/components/payments/core/payment_request_data_util.cc b/components/payments/core/payment_request_data_util.cc
index 7f689419603a7f6ac6d17d0017c271ce194d0820..8a9585f7c2fc03d1e1870814ed9f7e3019150c9b 100644
--- a/components/payments/core/payment_request_data_util.cc
+++ b/components/payments/core/payment_request_data_util.cc
@@ -6,6 +6,7 @@
 
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_country.h"
 #include "components/autofill/core/browser/autofill_data_util.h"
@@ -191,6 +192,26 @@ std::string FormatPhoneForResponse(const std::string& phone_number,
                            PhoneNumberUtil::PhoneNumberFormat::E164);
 }
 
+base::string16 FormatCardNumberForDisplay(const base::string16& card_number) {
+  base::string16 number = autofill::CreditCard::StripSeparators(card_number);
+  if (number.empty() || !base::IsAsciiDigit(number[0]))
+    return card_number;
+
+  std::vector<size_t> positions = {4U, 9U, 14U};
+  if (autofill::CreditCard::GetCardNetwork(number) ==
+      autofill::kAmericanExpressCard) {
+    positions = {4U, 11U};
+  }
+
+  static const base::char16 kSeparator = base::ASCIIToUTF16(" ")[0];
+  for (size_t i : positions) {
+    if (number.size() > i)
+      number.insert(i, 1U, kSeparator);
+  }
+
+  return number;
+}
+
 std::string GetCountryCodeWithFallback(const autofill::AutofillProfile* profile,
                                        const std::string& app_locale) {
   std::string country_code =