build: use class path bases, not strings

scripts/slave/recipe_modules/chromium_android/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.
 
 import types
 
 from recipe_engine.config import config_item_context, ConfigGroup
 from recipe_engine.config import ConfigList, Dict, List, Single, Static
 from recipe_engine.config_types import Path
 
-def BaseConfig(INTERNAL=False, REPO_NAME=None, REPO_URL=None,
+def BaseConfig(CHECKOUT_PATH, INTERNAL=False, REPO_NAME=None, REPO_URL=None,
                BUILD_CONFIG='Debug', REVISION='', **_kwargs):
   return ConfigGroup(
+    CHECKOUT_PATH = Static(CHECKOUT_PATH),
     INTERNAL = Static(INTERNAL),
     REPO_NAME = Static(REPO_NAME),
     REPO_URL = Static(REPO_URL),
     BUILD_CONFIG = Static(BUILD_CONFIG),
     revision = Single(basestring, empty_val=REVISION),
     revisions = Dict(value_type=(basestring, types.NoneType)),
     asan_symbolize = Single(bool, required=False, empty_val=False),
     get_app_manifest_vars = Single(bool, required=False, empty_val=True),
     run_tree_truth = Single(bool, required=False, empty_val=True),
     deps_file = Single(basestring, required=False, empty_val='.DEPS.git'),
     internal_dir_name = Single(basestring, required=False),
     # deps_dir: where to checkout the gclient deps file
     deps_dir = Single(basestring, required=False, empty_val=REPO_NAME),
     managed = Single(bool, required=False, empty_val=True),
     extra_deploy_opts = List(inner_type=basestring),
     tests = List(inner_type=basestring),
-    cr_build_android = Static(Path('[CHECKOUT]', 'build', 'android')),
+    cr_build_android = Static(CHECKOUT_PATH.join('build', 'android')),
     test_runner = Single(Path),
     gclient_custom_deps = Dict(value_type=(basestring, types.NoneType)),
     channel = Single(basestring, empty_val='chrome'),
     gclient_custom_vars = Dict(value_type=(basestring, types.NoneType)),
     coverage = Single(bool, required=False, empty_val=False),
     chrome_specific_wipe = Single(bool, required=False, empty_val=False),
     incremental_coverage = Single(bool, required=False, empty_val=False),
     env = ConfigGroup(
       LLVM_FORCE_HEAD_REVISION = Single(basestring, required=False),
     ),
     gce_setup = Single(bool, required=False, empty_val=False),
     gce_snapshot = Single(basestring, required=False),
     gce_count = Single(int, required=False),
   )
 
 
 config_ctx = config_item_context(BaseConfig)
 
 @config_ctx(is_root=True)
 def base_config(c):
   c.internal_dir_name = 'clank'
-  c.test_runner = Path('[CHECKOUT]', 'build', 'android', 'test_runner.py')
+  c.test_runner = c.CHECKOUT_PATH.join('build', 'android', 'test_runner.py')
 
 @config_ctx()
 def main_builder(c):
   pass
 
 @config_ctx()
 def main_builder_mb(c):
   pass
 
 @config_ctx()
@@ skipping 150 matching lines @@
 
 @config_ctx()
 def cast_builder(c):
   pass
 
 @config_ctx(includes=['x86_builder'])
 def gce_builder(c):
   c.gce_setup = True
   c.gce_snapshot = 'clean-22-l-phone-snapshot'
   c.gce_count = 6