Fix finding path to gcl when drover is run with a relative path....

drover.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 import optparse
 import os
 import re
 import subprocess
 import sys
@@ skipping 28 matching lines @@
 
 [Revert from branch]
 --revert <revision> --branch <branch_num>
 Example: %(app)s --revert 12345 --branch 187
 """
 
 export_map_ = None
 files_info_ = None
 delete_map_ = None
 file_pattern_ =  r"[ ]+([MADUC])[ ]+/((?:trunk|branches/.*?)/src(.*)/(.*))"
+depot_tools_dir_ = os.path.dirname(os.path.abspath(__file__))
 
 
 def runGcl(subcommand):
-  gcl_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "gcl")
+  gcl_path = os.path.join(depot_tools_dir_, "gcl")
   if not os.path.exists(gcl_path):
     print "WARNING: gcl not found beside drover.py. Using system gcl instead..."
     gcl_path = 'gcl'
 
   command = "%s %s" % (gcl_path, subcommand)
   return os.system(command)
 
 def gclUpload(revision, author):
   command = ("upload " + str(revision) +
              " --send_mail --no_presubmit --reviewers=" + author)
@@ skipping 488 matching lines @@
 
   if options.local and (options.revert or options.branch):
     option_parser.error("--local cannot be used with --revert or --branch")
     return 1
 
   return drover(options, args)
 
 
 if __name__ == "__main__":
   sys.exit(main())