cc: Add missing xdisplaycheck data dependency for tests.

cc/cc_tests.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,
     'cc_unit_tests_source_files': [
       'animation/animation_unittest.cc',
       'animation/keyframed_animation_curve_unittest.cc',
@@ skipping 395 matching lines @@
         '../testing/gtest.gyp:gtest',
         '../third_party/mesa/mesa.gyp:osmesa',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/gfx/gfx.gyp:gfx_geometry',
         '../ui/gfx/gfx.gyp:gfx_test_support',
         '../ui/gl/gl.gyp:gl',
       ],
       'sources': [
         '<@(cc_tests_support_files)',
       ],
+      'conditions': [
+        ['use_x11 == 1',
+          {
+            'dependencies': [
+              '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
+            ],
+          }
+        ],
+      ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
   'conditions': [
     ['OS == "android"',
       {
         'targets': [
           {
             'target_name': 'cc_unittests_apk',
@@ skipping 25 matching lines @@
         {
           'target_name': 'cc_unittests_run',
           'type': 'none',
           'dependencies': [
             'cc_unittests',
           ],
           'includes': [
             '../build/isolate.gypi',
           ],
           'sources': [
             'cc_unittests.isolate',

[jamesr, 2015/03/04 21:49:48]

since this specifies the isolate file that chooses xvfb it seems more logical
that this would additionally say that it requires xdisplaycheck

           ],
         },
       ],
     }],
   ],
 }