Run gn_unittests on gn_upload step.

scripts/slave/recipes/chromium_gn_upload.py

 # 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.
 
 from infra.libs.infra_types import freeze
 
 DEPS = [
   'bot_update',
   'chromium',
   'file',
@@ skipping 70 matching lines @@
   api.chromium.run_gn()
 
   api.chromium.compile(targets=['gn', 'gn_unittests'], force_clobber=True)
 
   path_to_binary = str(api.path['checkout'].join('out', 'Release', 'gn'))
   if api.platform.is_win:
     path_to_binary += '.exe'
 
   api.step('gn version', [path_to_binary, '--version'])
 
-  # TODO: crbug.com/443813 - if gn_unittests is run from any dir other
-  # than the checkout root, it'll fail. Unfortunately, if runtest
-  # is run from any place other than the checkout root (the directory
-  # above api.path['checkout']), it computes the path to the binary
-  # incorrectly and fails to find it :(.
-  # api.chromium.runtest('gn_unittests', cwd=api.path['checkout'])
+  api.chromium.runtest('gn_unittests', cwd=api.path['checkout'])
 
   api.python('upload',
              api.path['depot_tools'].join('upload_to_google_storage.py'),
              ['-b', 'chromium-gn', path_to_binary])
 
   sha1 = api.file.read('gn sha1', path_to_binary + '.sha1',
                        test_data='0123456789abcdeffedcba987654321012345678')
   api.step.active_result.presentation.step_text = sha1
 
 
 def GenTests(api):
   for test in api.chromium.gen_tests_for_builders(BUILDERS):
     yield test