[webnfc] Implement push method for Android nfc mojo service.

device/nfc/nfc.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
+    'android_support_v13_target%':
+    '../../third_party/android_tools/android_tools.gyp:android_support_v13_javalib',
   },
   'targets': [
     {
       # GN version: //device/nfc
       'target_name': 'device_nfc',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../url/url.gyp:url_lib',
       ],
@@ skipping 53 matching lines @@
         'use_new_wrapper_types': 'false',
       },
       'includes': [
         '../../mojo/mojom_bindings_generator.gypi',
       ],
       'sources': [
         'nfc.mojom',
       ],
     },
   ],
+  'conditions': [
+    ['OS == "android"', {
+      'targets': [
+        {
+          'target_name': 'device_nfc_java',
+          'type': 'none',
+          'dependencies': [
+            '<(android_support_v13_target)',
+            '../../base/base.gyp:base',
+            '../../mojo/mojo_public.gyp:mojo_bindings_java',
+            'device_nfc_mojo_bindings',
+          ],
+          'variables': {
+            'java_in_dir': '../../device/nfc/android/java',
+          },
+          'includes': [ '../../build/java.gypi' ],
+        },
+      ],
+    }, {  # OS != "android"
+    }],
+  ],
 }