Initial import.

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diff --git a/chromium/tools/prepare-bisect-perf-regression.py b/chromium/tools/prepare-bisect-perf-regression.py
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+++ b/chromium/tools/prepare-bisect-perf-regression.py
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+#!/usr/bin/env python
+# Copyright (c) 2013 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.
+
+"""Prepare Performance Test Bisect Tool
+
+This script is used by a trybot to create a working directory and sync an
+initial copy of the depot for use in bisecting performance regressions.
+
+An example usage:
+
+./tools/prepare-bisect-perf-regressions.py --working_directory "~/builds"
+  --output_buildbot_annotations
+
+Would result in creating ~/builds/bisect and then populating it with a copy of
+the depot.
+
+"""
+
+import optparse
+import sys
+
+import bisect_utils
+
+
+def main():
+
+  usage = ('%prog [options] [-- chromium-options]\n'
+           'Prepares a temporary depot for use on a trybot.')
+
+  parser = optparse.OptionParser(usage=usage)
+
+  parser.add_option('-w', '--working_directory',
+                    type='str',
+                    help='Path to the working directory where the script will '
+                    'do an initial checkout of the chromium depot. The '
+                    'files will be placed in a subdirectory "bisect" under '
+                    'working_directory and that will be used to perform the '
+                    'bisection.')
+  parser.add_option('--output_buildbot_annotations',
+                    action="store_true",
+                    help='Add extra annotation output for buildbot.')
+  parser.add_option('--target_platform',
+                    type='choice',
+                    choices=['chromium', 'cros', 'android'],
+                    default='chromium',
+                    help='The target platform. Choices are "chromium" (current '
+                    'platform), "cros", or "android". If you specify something '
+                    'other than "chromium", you must be properly set up to '
+                    'build that platform.')
+  (opts, args) = parser.parse_args()
+
+  if not opts.working_directory:
+    print 'Error: missing required parameter: --working_directory'
+    print
+    parser.print_help()
+    return 1
+
+  return bisect_utils.CreateBisectDirectoryAndSetupDepot(opts)
+
+
+if __name__ == '__main__':
+  sys.exit(main())