ozone: Add missing dependencies to build

ui/ozone/platform/caca/caca.gypi

 # Copyright 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.
 
 {
   'variables': {
     'internal_ozone_platform_deps': [
       'ozone_platform_caca',
     ],
     'internal_ozone_platforms': [
       'caca'
     ],
   },
   'targets': [
     {
       'target_name': 'ozone_platform_caca',
       'type': 'static_library',
       'defines': [
         'OZONE_IMPLEMENTATION',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
         '../../skia/skia.gyp:skia',
         '../events/events.gyp:events',
         '../events/ozone/events_ozone.gyp:events_ozone_layout',
+        '../events/platform/events_platform.gyp:events_platform',
         '../gfx/gfx.gyp:gfx',
         '../gfx/gfx.gyp:gfx_geometry',
       ],
       'link_settings': {
         'libraries': [
           '-lcaca',
         ],
       },
       'sources': [
         'caca_event_source.cc',
         'caca_event_source.h',
         'caca_window.cc',
         'caca_window.h',
         'caca_window_manager.cc',
         'caca_window_manager.h',
         'ozone_platform_caca.cc',
         'ozone_platform_caca.h',
         'scoped_caca_types.cc',
         'scoped_caca_types.h',
       ],
     },
   ],
 }