Fix interactive_ui_tests dependency on xtst

chrome/chrome_tests.gypi

 # Copyright 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.
 {
   'variables' : {
     'chromedriver_unittest_sources': [
       'test/chromedriver/capabilities_unittest.cc',
       'test/chromedriver/chrome/chrome_finder_unittest.cc',
       'test/chromedriver/chrome/console_logger_unittest.cc',
       'test/chromedriver/chrome/device_manager_unittest.cc',
@@ skipping 245 matching lines @@
         'test/base/interactive_test_utils_views.cc',
         'test/base/interactive_test_utils_win.cc',
         'test/base/interactive_ui_tests_main.cc',
         'test/base/view_event_test_base.cc',
         'test/base/view_event_test_base.h',
         'test/ppapi/ppapi_interactive_browsertest.cc',
       ],
       'conditions': [
         ['use_x11==1', {
           'dependencies': [
+            '../build/linux/system.gyp:xtst',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
           ],
         }],
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
           ],
           'sources!': [
             'browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc',
           ],
@@ skipping 2945 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }