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

device/nfc/nfc.gyp

Index: device/nfc/nfc.gyp
diff --git a/device/nfc/nfc.gyp b/device/nfc/nfc.gyp
index d76762119dd5085c00e3f38ca388b76fc7636206..09707fa5ff2bb1f602dc9b8c910e68f7356cb83c 100644
--- a/device/nfc/nfc.gyp
+++ b/device/nfc/nfc.gyp
@@ -5,6 +5,8 @@
 {
   'variables': {
     'chromium_code': 1,
+    'android_support_v13_target%':
+    '../../third_party/android_tools/android_tools.gyp:android_support_v13_javalib',
   },
   'targets': [
     {
@@ -78,4 +80,25 @@
       ],
     },
   ],
+  '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"
+    }],
+  ],
 }