Added separate checkout and config file generation to bisect script

build/util/run-bisect-perf-regression.cfg

Index: build/util/run-bisect-perf-regression.cfg
diff --git a/build/util/run-bisect-perf-regression.cfg b/build/util/run-bisect-perf-regression.cfg
new file mode 100644
index 0000000000000000000000000000000000000000..8de25647262fde84549405600c2261ea821174a7
--- /dev/null
+++ b/build/util/run-bisect-perf-regression.cfg
@@ -0,0 +1,28 @@
+# 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.
+
+"""Config file for Run Performance Test Bisect Tool
+
+This script is used by the run-bisect-perf-regression.py script.

[tonyg, 2013/02/14 01:03:43]

Recommend beefing up this description to describe exactly how this file is meant
to be used (since it is a little unusual). e.g. mention to edit, run git try
<bot>, and never submit changes.

[shatch, 2013/02/14 23:00:34]

Done.

+
+Sample config:
+
+config =\
+{
+  'command':'./out/Release/performance_ui_tests' +
+    ' --gtest_filter=PageCyclerTest.Intl1File',
+  'good_revision':'179755',
+  'bad_revision':'179782',
+  'metric':'times/t'
+}
+
+"""
+
+config =\

[tonyg, 2013/02/14 01:03:43]

I think we should have a PRESUBMIT.py check that verifies that this config
contains all empty fields. Otherwise, someone might accidentally check in their
change that is meant only for the tryservers.

Search for PRESUBMIT.py to see lots of examples in the codebase.

[shatch, 2013/02/14 23:00:34]

Done.

+{

[tonyg, 2013/02/14 01:03:43]

Recommend bringing this up to the line above here and in the sample

[shatch, 2013/02/14 23:00:34]

Done.

+  'command':'',

[tonyg, 2013/02/14 01:03:43]

Recommend space after colons in this block and in the sample

[shatch, 2013/02/14 23:00:34]

Done.

+  'good_revision':'',
+  'bad_revision':'',
+  'metric':'',
+}