Reland of [Payments] move //components/payments/content/*.mojom files to //components/payments/mojom

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
new file mode 100644
index 0000000000000000000000000000000000000000..f7eae0a4fdd2158202c5876c31694f92853ee763
--- /dev/null
+++ b/components/payments/mojom/payment_app.mojom
@@ -0,0 +1,57 @@
+// 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;
+
+import "components/payments/mojom/payment_request.mojom";
+import "mojo/common/time.mojom";
+import "url/mojo/url.mojom";
+
+enum PaymentAppManifestError {
+  NONE,
+  NOT_IMPLEMENTED,
+  NO_ACTIVE_WORKER,
+  MANIFEST_STORAGE_OPERATION_FAILED,
+};
+
+struct PaymentAppOption {
+  string name;
+  string? icon;
+  string id;
+  array<string> enabled_methods;
+};
+
+struct PaymentAppManifest {
+  string name;
+  string? icon;
+  array<PaymentAppOption> options;
+};
+
+interface PaymentManager {
+  Init(string service_worker_scope);
+  SetManifest(PaymentAppManifest payment_app_manifest)
+      => (PaymentAppManifestError error);
+  GetManifest()
+      => (PaymentAppManifest payment_app_manifest, PaymentAppManifestError error);
+};
+
+struct PaymentAppRequest {
+  url.mojom.Url origin;
+  array<PaymentMethodData> methodData;
+  PaymentItem total;
+  array<PaymentDetailsModifier> modifiers;
+  string optionId;
+};
+
+struct PaymentAppResponse {
+  string method_name;
+  string stringified_details;
+};
+
+// This interface is provided to pass a payment app response from payment
+// request event in renderer side to browser side by calling respondWith().
+interface PaymentAppResponseCallback {
+  OnPaymentAppResponse(PaymentAppResponse response,
+                       mojo.common.mojom.Time dispatch_event_time);
+};