In run-webkit-tests, start xvfb if necessary.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py
index 6a792fcadb8a06fd9119c6fe3cd0febfc96109df..6b261b5a5e51a8c91e962814f1baebf36531d304 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py
@@ -325,6 +325,8 @@ class Manager(object):
         self._delete_dirs(results_directories[:-self.ARCHIVED_RESULTS_LIMIT])
 
     def _set_up_run(self, test_names):
+        exit_code = self._port.setup_test_run()
+
         self._printer.write_update("Checking build ...")
         if self._options.build:
             exit_code = self._port.check_build(self._needs_servers(test_names), self._printer)
@@ -332,13 +334,6 @@ class Manager(object):
                 _log.error("Build check failed")
                 return exit_code
 
-        # Check that the system dependencies (themes, fonts, ...) are correct.
-        if not self._options.nocheck_sys_deps:
-            self._printer.write_update("Checking system dependencies ...")
-            exit_code = self._port.check_sys_deps(self._needs_servers(test_names))
-            if exit_code:
-                return exit_code
-
         if self._options.clobber_old_results:
             self._clobber_old_results()
         elif self._filesystem.exists(self._results_directory):
@@ -349,7 +344,13 @@ class Manager(object):
         # Create the output directory if it doesn't already exist.
         self._port.host.filesystem.maybe_make_directory(self._results_directory)
 
-        self._port.setup_test_run()
+        # Check that the system dependencies (themes, fonts, ...) are correct.
+        if not self._options.nocheck_sys_deps:
+            self._printer.write_update("Checking system dependencies ...")
+            exit_code = self._port.check_sys_deps(self._needs_servers(test_names))
+            if exit_code:
+                return exit_code
+
         return exit_codes.OK_EXIT_STATUS
 
     def _run_tests(self, tests_to_run, tests_to_skip, repeat_each, iterations,