Rework gclient 'recurse' command to use a WorkQueue.

tests/gclient_smoketest.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.
 
 """Smoke tests for gclient.py.
 
 Shell out 'gclient' and run basic conformance tests.
 
 This test assumes GClientSmokeBase.URL_BASE is valid.
@@ skipping 1141 matching lines @@
   def testRecurse(self):
     if not self.enabled:
       return
     self.gclient(['config', '--spec',
         'solutions=['
         '{"name": "src",'
         ' "url": "' + self.svn_base + 'trunk/src/"},'
         '{"name": "src-git",'
         '"url": "' + self.git_base + 'repo_1"}]'])
     self.gclient(['sync', '--deps', 'mac'])
-    results = self.gclient(['recurse', 'sh', '-c',
+    results = self.gclient(['recurse', '-j1', 'sh', '-c',
                             'echo $GCLIENT_SCM,$GCLIENT_URL,`pwd`'])
 
     entries = [tuple(line.split(','))
                for line in results[0].strip().split('\n')]
     logging.debug(entries)
 
     bases = {'svn': self.svn_base, 'git': self.git_base}
     expected_source = [
         ('svn', 'trunk/src/', 'src'),
         ('git', 'repo_1', 'src-git'),
@@ skipping 108 matching lines @@
 
   if '-c' in sys.argv:
     COVERAGE = True
     sys.argv.remove('-c')
     if os.path.exists('.coverage'):
       os.remove('.coverage')
     os.environ['COVERAGE_FILE'] = os.path.join(
         os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
         '.coverage')
   unittest.main()