linux/gyp: Find missing symbols at build time, not runtime.

ui/views/views.gyp

 # Copyright (c) 2012 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': {
     'chromium_code': 1,
     # Sources lists shared with GN build.
     'views_sources': [
       'accessibility/native_view_accessibility.cc',
       'accessibility/native_view_accessibility.h',
@@ skipping 657 matching lines @@
           'dependencies': [
             '../ozone/ozone.gyp:ozone',
           ],
         }],
         ['use_x11==1', {
           'dependencies': [
             '../../build/linux/system.gyp:x11',
             '../../build/linux/system.gyp:xrandr',
             '../events/devices/events_devices.gyp:events_devices',
             '../events/platform/x11/x11_events_platform.gyp:x11_events_platform',
+            '../gfx/x/gfx_x11.gyp:gfx_x11',
           ],
         }],
         ['use_aura==1', {
           'sources': [
             '<@(views_aura_sources)',
           ],
           'dependencies': [
             '../aura/aura.gyp:aura',
             '../wm/wm.gyp:wm',
           ],
         }],
         ['use_aura and chromeos == 0', {
           'sources': [ '<@(views_desktop_aura_sources)' ],
           'conditions': [
             ['use_x11 == 1', {
               'sources': [ '<@(views_desktop_aura_x11_sources)' ],
+              'link_settings': { 'libraries': [ '-lXext' ] },
             }],
             ['OS == "win"', {
               'sources': [ '<@(views_desktop_aura_win_sources)' ],
             }],
             ['use_ozone==1', {
               'sources': [ '<@(views_desktop_aura_ozone_sources)' ],
             }],
           ],
         }],
         ['OS=="mac"', {
@@ skipping 189 matching lines @@
                 '../aura/aura.gyp:aura',
                 '../wm/wm.gyp:wm',
               ],
             }],
           ],
         },  # target_name: macviews_interactive_ui_tests
       ],  # targets
     }],
   ],  # conditions
 }