Add gcl presubmit script to the dart src tree.

PRESUBMIT.py

Index: PRESUBMIT.py
===================================================================
--- PRESUBMIT.py	(revision 0)
+++ PRESUBMIT.py	(revision 0)
@@ -0,0 +1,18 @@
+# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+"""Top-level presubmit script for Dart.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into gcl.
+"""
+
+def CheckChangeOnCommit(input_api, output_api):
+  results = []
+  status_check = input_api.canned_checks.CheckTreeIsOpen(
+      input_api,
+      output_api,
+      json_url='http://dart-status.appspot.com/current?format=json')
+  results.extend(status_check)
+  return results
Property changes on: PRESUBMIT.py
___________________________________________________________________
Added: svn:eol-style
   + LF