Add currencySystem field to PaymentCurrencyAmount

third_party/WebKit/Source/modules/payments/PaymentsValidators.h

Index: third_party/WebKit/Source/modules/payments/PaymentsValidators.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentsValidators.h b/third_party/WebKit/Source/modules/payments/PaymentsValidators.h
index cf6db8e3c6f4b41f318b324ffca939acc4711c1f..8bef124eefd6bc612c549027816d697c0bff3822 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentsValidators.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentsValidators.h
@@ -17,10 +17,14 @@ class MODULES_EXPORT PaymentsValidators final {
 
  public:
   // The most common identifiers are three-letter alphabetic codes as defined by
-  // [ISO4217] (for example, "USD" for US Dollars) however any string of at most
-  // 2048 characters is considered valid. Returns false if currency |code| is
-  // too long (greater than 2048).
+  // [ISO4217] (for example, "USD" for US Dollars). |system| is a URL that
+  // indicates the currency system that the currency identifier belongs to. By
+  // default, the value is urn:iso:std:iso:4217 indicating that currency is
+  // defined by [[ISO4217]], however any string of at most 2048 characters is
+  // considered valid in other currencySystem. Returns false if currency |code|
+  // is too long (greater than 2048).
   static bool isValidCurrencyCodeFormat(const String& code,
+                                        const String& system,
                                         String* optionalErrorMessage);
 
   // Returns true if |amount| is a valid currency code as defined in ISO 20022