Try server and buildbot scripts now using Chromium scripts.

- compatible with depot_tools try commands.
- old build master is converted to use Chromium scripts, according to
http://www.chromium.org/developers/testing/chromium-build-infrastructure/getting-the-buildbot-source/forking-your-buildbot
- slaves can now be run out of a plain checkout, no local configuration needed.

Also added files to make it possible to use tools as a separate checkout.

BUG=None
TEST=Runs on local machine with remote slaves. I've successfully submitted try jobs with both git try and gcl try commands.

Review URL: https://webrtc-codereview.appspot.com/449011

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1945 4adac7df-926f-26a2-2b94-8c16560cd09d

tools/add_webrtc_slave_utils.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+#  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+#
+#  Use of this source code is governed by a BSD-style license
+#  that can be found in the LICENSE file in the root of the source
+#  tree. An additional intellectual property rights grant can be found
+#  in the file PATENTS.  All contributing project authors may
+#  be found in the AUTHORS file in the root of the source tree.
+
+__author__ = 'kjellander@webrtc.org (Henrik Kjellander)'
+
+import os
+
+
+def main():
+  """
+  Simple script for adding an import of the WebRTC slave_utils module for the
+  buildbot slaves to the Chromium buildbot.tac file.
+  Using this script, we don't need to maintain our own version of the slave
+  scripts and can automatically stay up to date with their changes.
+  It will add a comment and the import at the end of the file, if it's not
+  already present.
+
+  This script should be invoked as a hooks step in the DEPS file, like this:
+  hooks = [
+   {
+      # Update slave buildbot.tac to include WebRTC slave_utils import.
+      "pattern": ".",
+      "action": ["python", "tools/add_webrtc_slave_utils.py"],
+    },
+  ]
+  """
+  SCRIPT_PATH = os.path.dirname(os.path.abspath(__file__))
+  TARGET_FILE = os.path.join(SCRIPT_PATH,
+                             'continuous_build/build/slave/buildbot.tac')
+  COMMENT_LINE = '# Load WebRTC custom slave script.\n'
+  IMPORT_LINE = 'from webrtc_buildbot import slave_utils\n'
+
+  file = open(TARGET_FILE, 'r')
+  if file.read().find(IMPORT_LINE) == -1:
+    print 'Patching %s with WebRTC imports.' % TARGET_FILE
+    file.close()
+    file = open(TARGET_FILE, 'a')
+    file.write(COMMENT_LINE)
+    file.write(IMPORT_LINE)
+  file.close()
+
+if __name__ == '__main__':
+  main()