PaymentApp: Add classes for supporting Web Based Payment Apps

chrome/android/java/src/org/chromium/chrome/browser/payments/WebBasedPaymentAppBridge.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 org.chromium.payments.mojom.PaymentAppManifest;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Native bridge for interacting with web based payment apps.
+ */
+public class WebBasedPaymentAppBridge {
+    /**
+     * Get a map of all the app manifests keyed by the app id.
+     */
+    public Map<String, PaymentAppManifest> getAllAppManifests() {
+        // Not yet implemented
+        return new HashMap<>();
+    }
+}