Improve presubmit_support main by not stripping arguments.

presubmit_support.py

Index: presubmit_support.py
diff --git a/presubmit_support.py b/presubmit_support.py
index fc1c7f23b0c09d666c88b2e03cb19eb50b828ba4..22d32d14acc7dc6f74777105751f8fa437966932 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -1143,7 +1143,7 @@ def Main(argv):
                     "system directories will also be searched.")
   parser.add_option("--default_presubmit")
   parser.add_option("--may_prompt", action='store_true', default=False)
-  options, args = parser.parse_args(argv[1:])
+  options, args = parser.parse_args(argv)
   if options.verbose:
     logging.basicConfig(level=logging.DEBUG)
   if os.path.isdir(os.path.join(options.root, '.svn')):
@@ -1194,4 +1194,4 @@ def Main(argv):
 
 
 if __name__ == '__main__':
-  sys.exit(Main(sys.argv))
+  sys.exit(Main(None))