Reland "Skia: Maintain a checkout on swarming (compile) bots"

scripts/slave/isolation/recipes.isolate

 # Copyright 2014 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.
 #
 # This permits isolating the recipes so they can be run from a Swarming bot (or
 # anywhere, really).
 #
 # This file MUST be 4 directories down the root directory. It cannot be in
 # scripts/slave/. See recipe_modules/path/config.py.
 #
@@ skipping 12 matching lines @@
       '../../../infra/config/recipes.cfg',
       '../../../goma/',
       '../../tools/runit.py',
       '../annotation_utils.py',
       '../annotated_run.py',
       '../bootstrap.py',
       '../build_directory.py',
       '../cleanup_temp.py',
       '../compile.py',
       '../crash_utils.py',
+      '../gclient_safe_revert.py',
       '../gsutil',
       '../gsutil.bat',
       '../gtest/',
       '../gtest_slave_utils.py',
       '../performance_log_processor.py',
       '../recipes.py',
       '../recipes/',
       '../results_dashboard.py',
       '../runtest.py',
       '../runisolatedtest.py',
       '../skia/',
       '../slave_utils.py',
       '../telemetry_utils.py',
       '../xvfb.py',
     ],
   },
 }