[Web Payments] Common Payments validation

components/payments/android/BUILD.gn

+# 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.
+
+import("//build/config/android/config.gni")
+import("//build/config/android/rules.gni")
+
+static_library("payments_jni") {
+  sources = [
+    "payments_jni_registrar.cc",
+  ]
+  deps = [
+    ":jni_headers",
+    "//components/payments:payment_request",
+    "//components/payments:payment_validation",
+  ]
+}
+
+generate_jni("jni_headers") {
+  sources = [
+    "//chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentValidator.java",
+  ]
+  jni_package = "payments"
+}