PaymentApp: Add interfaces for implementing InvokePaymentApp().

components/payments/payment_app.mojom

Index: components/payments/payment_app.mojom
diff --git a/components/payments/payment_app.mojom b/components/payments/payment_app.mojom
index a12d53bd3af3dbb9ec9690232ca9fe38aa8822ba..8a5e27ed494d983d5332d10f6abb99f3b7af8fc2 100644
--- a/components/payments/payment_app.mojom
+++ b/components/payments/payment_app.mojom
@@ -4,6 +4,8 @@
 
 module payments.mojom;
 
+import "components/payments/payment_request.mojom";
+
 enum PaymentAppManifestError {
   NONE,
   NOT_IMPLEMENTED,
@@ -31,3 +33,11 @@ interface PaymentAppManager {
   GetManifest()
       => (PaymentAppManifest payment_app_manifest, PaymentAppManifestError error);
 };
+
+struct PaymentAppRequestData {
+  string origin;

[please use gerrit instead, 2017/01/09 14:42:12]

Can you make this a "Url" type? You would need to import the mojom file where
that's defined.

[zino, 2017/01/09 18:06:14]

Done.

+  array<PaymentMethodData> methodData;
+  PaymentItem total;
+  array<PaymentDetailsModifier> modifiers;
+  string optionId;
+};