Use Xvfb in isolated testing only if use_x11 is set

chrome/sync_integration_tests.isolate

 # Copyright 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.
 {
   'conditions': [
-    ['OS=="linux"', {
+    ['OS=="linux" and use_x11==1', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)',
           '<(PRODUCT_DIR)/sync_integration_tests<(EXECUTABLE_SUFFIX)',
           '--test-launcher-bot-mode',
         ],
         'files': [
           '../testing/test_env.py',
           '../testing/xvfb.py',
+          '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
+        ],
+      },
+    }],
+    ['OS=="linux"', {
+      'variables': {
+        'files': [
           '<(PRODUCT_DIR)/libffmpegsumo.so',
           '<(PRODUCT_DIR)/libosmesa.so',
         ],
       },
     }],
-    ['OS=="linux" and use_ozone==0', {
-      'variables': {
-        'files': [
-          '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
-        ],
-      },
-    }],
     ['OS=="linux" or OS=="win"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/chrome_100_percent.pak',
           '<(PRODUCT_DIR)/locales/en-US.pak',
         ],
       },
     }],
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'files': [
           '../chrome/test/data/sync/',
           '../net/tools/testserver/',
           '../sync/tools/testserver/',
           '../third_party/pyftpdlib/',
           '../third_party/pywebsocket/',
           '../third_party/tlslite/',
           '<(PRODUCT_DIR)/pyproto/',
           '<(PRODUCT_DIR)/resources.pak',
           '<(PRODUCT_DIR)/sync_integration_tests<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
-    ['OS=="mac" or OS=="win"', {
+    ['OS=="mac" or OS=="win" or use_ozone==1', {
       'variables': {
         'command': [
           '<(PRODUCT_DIR)/sync_integration_tests<(EXECUTABLE_SUFFIX)',
           '--test-launcher-bot-mode',
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
         'files': [
@@ skipping 31 matching lines @@
           '<(PRODUCT_DIR)/libexif.so',
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
     '../gin/v8.isolate',
   ],
 }