Separate xvfb.py logic into its own script

testing/test_env.py

+#!/usr/bin/env python
+# 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.
+
+"""Sets environment variables needed to run a chromium unit test."""
+
+import os
+import subprocess
+import sys
+
+# This is hardcoded to be src/ relative to this script.
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+def run_executable(cmd, env):
+  """Runs an executable with:
+    - environment variable CR_SOURCE_ROOT set to the root directory.
+    - environment variable LANGUAGE to en_US.UTF-8.
+    - Reuses sys.executable automatically.
+  """
+  # Many tests assume a English interface...
+  env['LANGUAGE'] = 'en_US.UTF-8'
+  # Used by base/base_paths_linux.cc
+  env['CR_SOURCE_ROOT'] = os.path.abspath(ROOT_DIR).encode('utf-8')
+  if cmd[0].endswith('.py'):
+    cmd.insert(0, sys.executable)
+  return subprocess.call(cmd, env=env)
+
+
+def main():
+  return run_executable(sys.argv[1:], os.environ.copy())
+
+
+if __name__ == "__main__":
+  sys.exit(main())