Create native_viewport_service, don't build it into mojo_shell unless Android

mojo/mojo_services.gypi

 # Copyright (c) 2014 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.
 
 {
   'targets': [
     {
       # GN version: //mojo/services/dbus_echo:bindings
       'target_name': 'mojo_echo_bindings',
       'type': 'static_library',
@@ skipping 272 matching lines @@
         }],
         ['use_x11==1', {
           'dependencies': [
             '../ui/platform_window/x11/x11_window.gyp:x11_window',
             '../ui/events/platform/x11/x11_events_platform.gyp:x11_events_platform',
           ],
         }],
       ],
     },
     {
+      'target_name': 'mojo_native_viewport_service',
+      'type': 'loadable_module',
+      'dependencies': [
+        'mojo_native_viewport_bindings',
+        'mojo_native_viewport_service_lib',
+        '<(mojo_gles2_for_loadable_module)',
+        '<(mojo_system_for_loadable_module)',
+      ],
+      'export_dependent_settings': [
+        'mojo_native_viewport_bindings',
+      ],
+      'sources': [
+        'services/native_viewport/main.cc',
+      ],
+    },
+    {
       # GN version: //mojo/services/public/interfaces/navigation
       'target_name': 'mojo_navigation_bindings',
       'type': 'static_library',
       'sources': [
         'services/public/interfaces/navigation/navigation.mojom',
       ],
       'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
         'mojo_base.gyp:mojo_cpp_bindings',
       ],
@@ skipping 557 matching lines @@
             'mojo_echo_bindings',
           ],
           'sources': [
             'services/dbus_echo/dbus_echo_service.cc',
           ],
         },
       ],
     }],
   ],
 }