PaymentApp: Add classes for supporting Web Based Payment Apps

chrome/android/java/src/org/chromium/chrome/browser/payments/ServiceWorkerPaymentAppBridge.java

+// 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.
+
+package org.chromium.chrome.browser.payments;
+
+import android.graphics.drawable.Drawable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Native bridge for interacting with service worker based payment apps.
+ */
+public class ServiceWorkerPaymentAppBridge {
+    /**
+     * This class represents a payment app manifest as defined in the Payment
+     * App API specification.
+     *
+     * @see https://w3c.github.io/webpayments-payment-apps-api/#payment-app-manifest
+     */
+    public static class Manifest {
+        public String id;
+        public String label;
+        public Drawable icon;
+        public List<Option> options = new ArrayList<>();
+    }
+
+    /**
+     * This class represents a payment option as defined in the Payment App API
+     * specification.
+     *
+     * @see https://w3c.github.io/webpayments-payment-apps-api/#payment-app-options
+     */
+    public static class Option {
+        public String id;
+        public String label;
+        public Drawable icon;
+        public List<String> enabledMethods = new ArrayList<>();
+    }
+
+    /**
+     * Get a list of all the installed app manifests.
+     */
+    public List<Manifest> getAllAppManifests() {
+        // TODO(tommyt): crbug.com/669876. Implement this function.
+        return new ArrayList<Manifest>();
+    }
+}