[Payments] Allow users enable and disable Android payment apps in payment request

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

+// Copyright 2017 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.base.ContextUtils;
+
+/** Place to define and control payment preferences. */
+public class PaymentPreferencesUtil {
+    // Avoid instantiation by accident.
+    private PaymentPreferencesUtil() {}
+
+    /** Preference to indicate whether payment request has been completed successfully once.*/
+    private static final String PAYMENT_COMPLETE_ONCE = "payment_complete_once";
+
+    /** Prefix of the preferences to persist Android payment apps' status. */
+    public static final String PAYMENT_ANDROID_APP_ENABLED_ = "payment_android_app_enabled_";
+
+    /**
+     * Checks whehter the payment request has been successfully completed once.
+     *
+     * @return True If payment request has been successfully completed once.
+     */
+    public static boolean isPaymentCompleteOnce() {
+        return ContextUtils.getAppSharedPreferences().getBoolean(PAYMENT_COMPLETE_ONCE, false);
+    }
+
+    /** Sets the payment request has been successfully completed once. */
+    public static void setPaymentCompleteOnce() {
+        ContextUtils.getAppSharedPreferences()
+                .edit()
+                .putBoolean(PAYMENT_COMPLETE_ONCE, true)
+                .apply();
+    }
+
+    /**
+     * Checks whether the Android payment app is enabled by user from the settings. The default
+     * status is enabled.
+     *
+     * @param packageName The package name of the Android payment app.
+     * @return True If the Android payment app is enabled by user.
+     */
+    public static boolean isAndroidPaymentAppEnabled(String packageName) {
+        return ContextUtils.getAppSharedPreferences().getBoolean(
+                getAndroidPaymentAppEnabledPreferenceKey(packageName), true);
+    }
+
+    /**
+     * Gets preference key for status of the Android payment app.
+     *
+     * @param packageName The packageName of the Android payment app.
+     * @return The preference key.
+     */
+    public static String getAndroidPaymentAppEnabledPreferenceKey(String packageName) {
+        return PAYMENT_ANDROID_APP_ENABLED_ + packageName;
+    }
+}