PaymentApp: Initial implementation for PaymentAppManager.setManifest().

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
new file mode 100644
index 0000000000000000000000000000000000000000..ca8a97a4d1af999266d87349da47f4fe1e947c6f
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+++ b/components/payments/payment_app.mojom
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+// 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,
+};
+
+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);
+};