Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/path/config.py

 # Copyright 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.
 
-from slave.recipe_config import config_item_context, ConfigGroup, Dict, Static
-from slave.recipe_config_types import Path
+from recipe_engine.config import config_item_context, ConfigGroup, Dict, Static
+from recipe_engine.config_types import Path
 
 def BaseConfig(CURRENT_WORKING_DIR, TEMP_DIR, **_kwargs):
   assert CURRENT_WORKING_DIR[0].endswith(('\\', '/'))
   assert TEMP_DIR[0].endswith(('\\', '/'))
   return ConfigGroup(
     # base path name -> [tokenized absolute path]
     base_paths    = Dict(value_type=tuple),
 
     # dynamic path name -> Path object (referencing one of the base_paths)
     dynamic_paths = Dict(value_type=(Path, type(None))),
@@ skipping 32 matching lines @@
   c.base_paths['slave_build'] = c.CURRENT_WORKING_DIR
   for token in ('build_internal', 'build', 'depot_tools'):
     c.base_paths[token] = c.base_paths['root'] + (token,)
   c.dynamic_paths['checkout'] = None
 
 @config_ctx(includes=['buildbot'])
 def swarming(c):
   c.base_paths['slave_build'] = (
       c.CURRENT_WORKING_DIR[:1] +
       ('b', 'fake_build', 'slave', 'fake_slave', 'build'))