events: Create a separate platforms target.

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1047 matching lines @@
               'dependencies': [
                 '../build/linux/system.gyp:dbus',
                 '../build/linux/system.gyp:fontconfig',
                 '../dbus/dbus.gyp:dbus',
               ],
             }],
             # x11 build
             ['use_x11==1', {
               'dependencies': [
                 '../build/linux/system.gyp:x11',
+                '../ui/events/platform/events_platform.gyp:events_platform',
+                '../ui/events/platform/x11/x11_events_platform.gyp:x11_events_platform',
               ],
             }],
           ],
         }],
         ['safe_browsing==1', {
           'defines': [
             'FULL_SAFE_BROWSING',
           ],
         }],
         ['safe_browsing==2', {
@@ skipping 152 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/extensions/api/cast_channel/cast_channel.proto' ],
       'variables': {
           'proto_in_dir': 'browser/extensions/api/cast_channel',
           'proto_out_dir': 'chrome/browser/extensions/api/cast_channel',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],  # 'conditions'
 }