add git_cache to base_paths

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 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(('\\', '/'))
@@ skipping 18 matching lines @@
 
 @config_ctx(is_root=True)
 def BASE(c):
   c.base_paths['cwd'] = c.CURRENT_WORKING_DIR
   c.base_paths['tmp_base'] = c.TEMP_DIR
 
 @config_ctx()
 def buildbot(c):
   c.base_paths['root'] = c.CURRENT_WORKING_DIR[:-4]
   c.base_paths['slave_build'] = c.CURRENT_WORKING_DIR
+  c.base_paths['git_cache'] = c.base_paths['root'] + ('slave', 'cache_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()
 def example(c):
   c.base_paths['slave_build'] = c.CURRENT_WORKING_DIR
   c.dynamic_paths['borts'] = 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'))
 
 @config_ctx()
 def kitchen(c):
   # TODO(phajdan.jr): Fully implement the kitchen config.
   c.base_paths['root'] = c.CURRENT_WORKING_DIR
   c.base_paths['slave_build'] = c.CURRENT_WORKING_DIR
+  c.base_paths['git_cache'] = c.base_paths['root'] + ('cache_dir',)
   c.dynamic_paths['checkout'] = None