Make breakpad, gcl and presubmit_support dependencies optional

gcl.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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.
 
 """Wrapper script around Rietveld's upload.py that groups files into
 changelists."""
 
 import getpass
 import os
@@ skipping 863 matching lines @@
   def FindGclientRootDir(from_dir):
     path = os.path.realpath(from_dir)
     while not os.path.exists(os.path.join(path, '.gclient')):
       next = os.path.split(path)
       if not next[1]:
         return None
       path = next[0]
     return path
 
   trychange_args = []
+  settings = {
+    'port': GetCodeReviewSetting('TRYSERVER_HTTP_PORT'),
+    'host': GetCodeReviewSetting('TRYSERVER_HTTP_HOST'),
+    'svn_repo': GetCodeReviewSetting('TRYSERVER_SVN_URL'),
+    'project': GetCodeReviewSetting('TRYSERVER_PROJECT'),
+    'root': GetCodeReviewSetting('TRYSERVER_ROOT'),
+    'patchlevel': GetCodeReviewSetting('TRYSERVER_PATCHLEVEL'),
+  }
+  for (k, v) in settings.iteritems():
+    if v:
+      trychange_args.extend(['--' + k, v])
+
   gclient_root = FindGclientRootDir(GetRepositoryRoot())
   if gclient_root:
     trychange_args.extend(['--root', PathDifference(gclient_root,
                                                     GetRepositoryRoot())])
   if change_info:
     trychange_args.extend(['--name', change_info.name])
     if change_info.issue:
       trychange_args.extend(["--issue", str(change_info.issue)])
     if change_info.patchset:
       trychange_args.extend(["--patchset", str(change_info.patchset)])
@@ skipping 374 matching lines @@
       return 0
     args =["svn", command]
     root = GetRepositoryRoot()
     args.extend([os.path.join(root, x) for x in change_info.GetFileNames()])
     RunShell(args, True)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())