Have the DEPS only parsed in the relevant thread.

tests/gclient_test.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Unit tests for gclient.py.
 
 See gclient_smoketest.py for integration tests.
 """
 
@@ skipping 171 matching lines @@
     self._check_requirements(
         obj,
         {
           'foo': [],
           'bar': [],
           'bar/empty': ['bar'],
         })
 
   def _check_requirements(self, solution, expected):
     for dependency in solution.dependencies:
-      self.assertEquals(
-          expected.pop(dependency.name), sorted(dependency.requirements))
+      e = expected.pop(dependency.name)
+      a = sorted(dependency.requirements)
+      self.assertEquals(e, a, (dependency.name, e, a))
     self.assertEquals({}, expected)
 
   def _get_processed(self):
     """Retrieves the item in the order they were processed."""
     items = []
     try:
       while True:
         items.append(self.processed.get_nowait())
     except Queue.Empty:
       pass
@@ skipping 45 matching lines @@
   sys.stdout = gclient_utils.MakeFileAutoFlush(sys.stdout)
   sys.stdout = gclient_utils.MakeFileAnnotated(sys.stdout, include_zero=True)
   sys.stderr = gclient_utils.MakeFileAutoFlush(sys.stderr)
   sys.stderr = gclient_utils.MakeFileAnnotated(sys.stderr, include_zero=True)
   logging.basicConfig(
       level=[logging.ERROR, logging.WARNING, logging.INFO, logging.DEBUG][
         min(sys.argv.count('-v'), 3)],
       format='%(relativeCreated)4d %(levelname)5s %(module)13s('
               '%(lineno)d) %(message)s')
   unittest.main()