Add stylus_protocol dependency.

components/exo.gypi

 # Copyright 2015 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: //components/exo
       'target_name': 'exo',
       'type': 'static_library',
@@ skipping 64 matching lines @@
             '..',
           ],
           'dependencies': [
             '../base/base.gyp:base',
             '../ipc/ipc.gyp:ipc',
             '../skia/skia.gyp:skia',
             '../third_party/wayland-protocols/wayland-protocols.gyp:alpha_compositing_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:gaming_input_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:remote_shell_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:secure_output_protocol',
+            '../third_party/wayland-protocols/wayland-protocols.gyp:stylus_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:viewporter_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:xdg_shell_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:vsync_feedback_protocol',
             '../third_party/wayland/wayland.gyp:wayland_server',
             '../ui/aura/aura.gyp:aura',
             '../ui/events/events.gyp:dom_keycode_converter',
             '../ui/display/display.gyp:display',
             '../ui/events/events.gyp:events_base',
             '../ui/views/views.gyp:views',
             'exo',
@@ skipping 20 matching lines @@
               'defines': [
                 'USE_XKBCOMMON',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }