PaymentApp: Add classes for supporting Web Based Payment Apps

chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentAppFactory.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.content.Context;
 
 import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.content_public.browser.WebContents;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
  * Builds instances of payment apps.
  */
 public class PaymentAppFactory {
     /**
      * Can be used to build additional types of payment apps without Chrome knowing about their
      * types.
      */
     private static PaymentAppFactoryAddition sAdditionalFactory;
 
     /**
+     * Native bridge that can be used to retrieve information about installed service worker
+     * payment apps.
+     */
+    private static ServiceWorkerPaymentAppBridge sServiceWorkerPaymentAppBridge;
+
+    /**
      * The interface for additional payment app factories.
      */
     public interface PaymentAppFactoryAddition {
         /**
          * Builds instances of payment apps.
          *
          * @param context     The application context.
          * @param webContents The web contents that invoked PaymentRequest.
          */
         List<PaymentApp> create(Context context, WebContents webContents);
     }
 
     /**
      * Sets the additional factory that can build instances of payment apps.
      *
      * @param additionalFactory Can build instances of payment apps.
      */
     @VisibleForTesting
     public static void setAdditionalFactory(PaymentAppFactoryAddition additionalFactory) {
         sAdditionalFactory = additionalFactory;
     }
 
     /**
+     * Set a custom native bridge for service worker payment apps for testing.
+     */
+    @VisibleForTesting
+    public static void setServiceWorkerPaymentAppBridgeForTest(
+            ServiceWorkerPaymentAppBridge bridge) {
+        sServiceWorkerPaymentAppBridge = bridge;
+    }
+
+    /**
      * Builds instances of payment apps.
      *
      * @param context     The context.
      * @param webContents The web contents where PaymentRequest was invoked.
      */
     public static List<PaymentApp> create(Context context, WebContents webContents) {
         List<PaymentApp> result = new ArrayList<>(2);
         result.add(new AutofillPaymentApp(context, webContents));
+
+        result.addAll(createServiceWorkerPaymentApps());
+
         if (sAdditionalFactory != null) {
             result.addAll(
                     sAdditionalFactory.create(context, webContents));
         }
         return result;
     }
+
+    /**
+     * Build a ServiceWorkerPaymentApp instance for each installed service
+     * worker based payment app.
+     */
+    private static List<ServiceWorkerPaymentApp> createServiceWorkerPaymentApps() {
+        if (sServiceWorkerPaymentAppBridge == null) {
+            if (ChromeFeatureList.isEnabled(ChromeFeatureList.SERVICE_WORKER_PAYMENT_APPS)) {
+                sServiceWorkerPaymentAppBridge = new ServiceWorkerPaymentAppBridge();
+            } else {
+                return new ArrayList<>();
+            }
+        }
+
+        List<ServiceWorkerPaymentApp> result = new ArrayList<>();
+
+        for (ServiceWorkerPaymentAppBridge.Manifest manifest :
+                sServiceWorkerPaymentAppBridge.getAllAppManifests()) {
+            result.add(new ServiceWorkerPaymentApp(manifest));
+        }
+
+        return result;
+    }
 }