Add Paths as first-class types in configs.

scripts/slave/recipes/gpu.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.
 
 # This recipe is intended to control all of the GPU related bots:
 #   chromium.gpu
 #   chromium.gpu.fyi
 #   The GPU bots on the chromium.webkit waterfall
 #   The GPU bots on the tryserver.chromium waterfall
 
@@ skipping 11 matching lines @@
   'content_gl_tests',
   'gles2_conform_test',
   'gl_tests'
 ]
 
 def GenSteps(api):
   # These values may be replaced by external configuration later
   dashboard_upload_url = 'https://chromeperf.appspot.com'
   generated_dir = api.path.slave_build('content_gpu_data', 'generated')
   reference_dir = api.path.slave_build('content_gpu_data', 'reference')
-  gsutil = api.path.build('scripts', 'slave', 'gsutil', wrapper=True)
+  gsutil = api.path.build('scripts', 'slave', 'gsutil',
+                          platform_ext={'win': '.bat'})
 
   api.chromium.set_config('chromium')
   api.gclient.apply_config('chrome_internal')
 
   # Don't skip the frame_rate data, as it's needed for the frame rate tests.
   # Per iannucci@, it can be relied upon that solutions[1] is src-internal.
   # Consider adding a 'gpu' module so that this can be managed in a
   # 'gpu' config.
   del api.gclient.c.solutions[1].custom_deps[
     'src/chrome/test/data/perf/frame_rate/private']
@@ skipping 102 matching lines @@
         api.properties.scheduled(build_config=build_config) +
         api.platform.name(plat)
       )
 
       # Try server configuration
       yield (
         api.test('%s_tryserver' % base_name) +
         api.properties.tryserver(build_config=build_config) +
         api.platform.name(plat)
       )