Chromecast: adds disable_display define for headless builds.

chromecast/chromecast_tests.gypi

 # Copyright (c) 2014 Google Inc. 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': 'cast_tests',
       'type': 'none',
       'dependencies': [
@@ skipping 28 matching lines @@
         '../url/url.gyp:url_unittests',
       ],
       'variables': {
         'filters': [
           # Disable OutOfMemoryDeathTest.ViaSharedLibraries due to gTrusty eglibc incompatibility
           # See: crbug/428211
           'base_unittests --gtest_filter=-OutOfMemoryDeathTest.ViaSharedLibraries',
         ],
       },
       'conditions': [
+        ['disable_display==0', {
+          'dependencies': [
+            '../gpu/gpu.gyp:gpu_unittests',
+          ],
+        }],
+      ],
+      'conditions': [
         ['OS!="android"', {
           'dependencies': [
             'cast_shell_browser_test',
           ],
           'variables': {
             'filters': [
               'cast_shell_browser_test --no-sandbox',
             ],
           },
         }],
@@ skipping 131 matching lines @@
             'HAS_OUT_OF_PROC_TEST_RUNNER',
           ],
           'sources': [
             'browser/test/chromecast_shell_browser_test.cc',
           ],
         },
       ],  # end of targets
     }],
   ],  # end of conditions
 }