PaymentApp: Implement PaymentAppManager.setManifest().

components/payments/payment_app.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module payments.mojom;
 
 enum PaymentAppManifestError {
   NONE,
   NOT_IMPLEMENTED,
+  NO_ACTIVE_WORKER,
+  STORE_MANIFEST_FAILED,
 };
 
 struct PaymentAppOption {
   string label;
   string? icon;
   string id;
   array<string> enabled_methods;
 };
 
 struct PaymentAppManifest {
   string label;
   string? icon;
   array<PaymentAppOption> options;
 };
 
 interface PaymentAppManager {
   SetManifest(string service_worker_scope, PaymentAppManifest payment_app_manifest)
       => (PaymentAppManifestError error);
 };