Add script for syncing Chrome to a specified directory.

BUG=chromium-os:36324
TEST=Remote trybot runs with CL:37965 for all trybots that build Chrome.

Change-Id: I8a1e8c2c9191495cd641c62d43938195ed621e1f
Reviewed-on: https://gerrit.chromium.org/gerrit/37923
Commit-Ready: David James <davidjames@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: David James <davidjames@chromium.org>
diff --git a/scripts/sync_chrome.py b/scripts/sync_chrome.py
new file mode 100644
index 0000000..a3be309
--- /dev/null
+++ b/scripts/sync_chrome.py
@@ -0,0 +1,52 @@
+# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Sync the Chrome source code used by Chrome OS to the specified directory."""
+
+from chromite.lib import commandline
+from chromite.lib import cros_build_lib
+from chromite.lib import gclient
+from chromite.lib import osutils
+
+
+def GetParser():
+  """Creates the argparse parser."""
+  parser = commandline.ArgumentParser(description=__doc__)
+
+  version = parser.add_mutually_exclusive_group()
+  version.add_argument('--tag', help='Sync to specified Chrome release',
+                       dest='version')
+  version.add_argument('--revision', help='Sync to specified SVN revision',
+                       type=int, dest='version')
+
+  parser.add_argument('--internal', help='Sync internal version of Chrome',
+                      action='store_true', default=False)
+  parser.add_argument('--pdf', help='Sync PDF source code',
+                      action='store_true', default=False)
+  parser.add_argument('--reset', help='Revert local changes',
+                      action='store_true', default=False)
+  parser.add_argument('--gclient', help=commandline.argparse.SUPPRESS,
+                      default='gclient')
+  parser.add_argument('chrome_root', help='Directory to sync chrome in')
+
+  return parser
+
+
+def main(args):
+  parser = GetParser()
+  options = parser.parse_args(args)
+
+  # Revert any lingering local changes.
+  if not osutils.SafeMakedirs(options.chrome_root) and options.reset:
+    try:
+      gclient.Revert(options.gclient, options.chrome_root)
+    except cros_build_lib.RunCommandError:
+      osutils.RmDir(options.chrome_root)
+      osutils.SafeMakedirs(options.chrome_root)
+
+  # Sync new Chrome.
+  gclient.WriteConfigFile(options.gclient, options.chrome_root,
+                          options.internal, options.pdf, options.version)
+  gclient.Sync(options.gclient, options.chrome_root, options.reset)
+  return 0