Java implementation of PaymentRequest mojo service

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

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentAppFactory.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentAppFactory.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentAppFactory.java
new file mode 100644
index 0000000000000000000000000000000000000000..3da7c709759d11671497345baaf75a97865ea50c
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentAppFactory.java
@@ -0,0 +1,54 @@
+// 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 org.chromium.content_public.browser.WebContents;
+
+import java.util.LinkedList;
+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 Addition sAdditionalFactory;
+
+    /**
+     * The interface for additional payment app factories.
+     */
+    public interface Addition {

[Ted C, 2016/04/22 03:59:37]

In general, I like to keep interface names qualified beyond the containing class
name (Addition w/o the paymentappfactory isn't sufficient).  Maybe
SupplementalPaymentAppsProvider <ahh...good ol' java>

[please use gerrit instead, 2016/04/25 19:22:30]

Done.

+        /**
+         * Builds instances of payment apps.
+         */
+        List<PaymentApp> create(WebContents webContents);
+    }
+
+    /**
+     * Sets the additional factory that can build instances of payment apps.
+     *
+     * @param additionalFactory Can build instances of payment apps.
+     */
+    public static void setAdditionalFactory(Addition additionalFactory) {
+        sAdditionalFactory = additionalFactory;
+    }
+
+    /**
+     * Builds instances of payment apps.
+     *
+     * @param webContents The web contents where PaymentRequest was invoked.
+     */
+    public static List<PaymentApp> create(WebContents webContents) {
+        List<PaymentApp> result = new LinkedList<PaymentApp>();
+        result.add(new AutofillPaymentApp(webContents));
+        if (sAdditionalFactory != null) {
+            result.addAll(sAdditionalFactory.create(webContents));
+        }
+        return result;
+    }
+}