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.CommandLine;
 import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.browser.ChromeSwitches;
 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;
 
+    private static ServiceWorkerPaymentAppBridge sServiceWorkerPaymentAppBridge =
+            new ServiceWorkerPaymentAppBridge();
+
     /**
      * 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.
          */
@@ skipping 12 matching lines @@
 
     /**
      * 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));
+
+        if (CommandLine.getInstance().hasSwitch(

[please use gerrit instead, 2016/11/30 15:08:28]

The new way to add command line flags is base::Feature. See
https://codereview.chromium.org/2452243002/ for an example. There's no need to
add an entry to chrome://flags at this time.

[tommyt, 2016/12/01 13:55:49]

Done.

+                ChromeSwitches.ENABLE_SERVICE_WORKER_PAYMENT_APPS)) {
+            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() {
+        List<ServiceWorkerPaymentApp> result = new ArrayList<>();
+        for (ServiceWorkerPaymentAppBridge.Manifest manifest :
+                sServiceWorkerPaymentAppBridge.getAllAppManifests()) {
+            result.add(new ServiceWorkerPaymentApp(manifest));
+        }
+        return result;
+    }
 }