Accept any string for currency code in PaymentRequest.

third_party/WebKit/Source/modules/payments/PaymentCurrencyAmount.idl

Index: third_party/WebKit/Source/modules/payments/PaymentCurrencyAmount.idl
diff --git a/third_party/WebKit/Source/modules/payments/PaymentCurrencyAmount.idl b/third_party/WebKit/Source/modules/payments/PaymentCurrencyAmount.idl
index b022c715f15825c5a6376dc4f6c63eaa03c084af..fcc67d44c6a66823dd008ad856c7237a80bb58fc 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentCurrencyAmount.idl
+++ b/third_party/WebKit/Source/modules/payments/PaymentCurrencyAmount.idl
@@ -7,6 +7,6 @@
 [
     RuntimeEnabled=PaymentRequest
 ] dictionary PaymentCurrencyAmount {
-    required DOMString currency;
+    [TreatNullAs=NullString] required DOMString currency;

[please use gerrit instead, 2016/08/25 16:47:38]

Let's not allow nulls. At least an empty string should be specified.

[haraken, 2016/08/26 01:20:05]

Right, [TreatNullAs] must be accompanied with EmptyString per the spec:

https://www.w3.org/TR/WebIDL/#TreatNullAs

[pals, 2016/08/26 07:20:26]

['Null currency code should throw', null, function() {
            new PaymentRequest([{'supportedMethods': ['foo']}],
buildDetails(detailNames[i], {'currency': null}))
        }],

For this test case, the value of |item.amount().currency()| in [1] is coming as
"null", so its not throwing any exception.

[1]
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/paymen...

[please use gerrit instead, 2016/08/26 17:01:37]

OK

     required DOMString value;
 };