[Payments] Implement payment instrument icons

components/payments/mojom/payment_app.mojom

Index: components/payments/mojom/payment_app.mojom
diff --git a/components/payments/mojom/payment_app.mojom b/components/payments/mojom/payment_app.mojom
index f0bd4dd975e8eff45872a1b7ba57cb1cbdae10c8..e5d101dc7d12923298428b17c2e04391a7bd06cf 100644
--- a/components/payments/mojom/payment_app.mojom
+++ b/components/payments/mojom/payment_app.mojom
@@ -14,10 +14,18 @@ enum PaymentHandlerStatus {
   NOT_FOUND,
   NO_ACTIVE_WORKER,
   STORAGE_OPERATION_FAILED,
+  FETCH_INSTRUMENT_ICON_FAILED,
+};
+
+struct ImageObject {
+  string src;
+  string sizes;
+  string type;
 };
 
 struct PaymentInstrument {
   string name;
+  array<ImageObject> icons;
   array<string> enabled_methods;
   string stringified_capabilities;
 };