Add swarm_presubmit recipe

infra/bots/recipe_modules/vars/api.py

 # Copyright 2016 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.
 
 
 # pylint: disable=W0201
 
 
 from recipe_engine import recipe_api
 
@@ skipping 30 matching lines @@
     self.m.path.c.base_paths['depot_tools'] = (
         self.m.path.c.base_paths['slave_build'] +
         ('skia', 'infra', 'bots', '.recipe_deps', 'depot_tools'))
     if 'Win' in self.builder_name:
       self.m.path.c.base_paths['depot_tools'] = (
           'c:\\', 'Users', 'chrome-bot', 'depot_tools')
 
     # Compile bots keep a persistent checkout.
     self.persistent_checkout = (self.is_compile_bot or
                                 'RecreateSKPs' in self.builder_name or
-                                '-CT_' in self.builder_name)
+                                '-CT_' in self.builder_name or
+                                'Presubmit' in self.builder_name)
     if self.persistent_checkout:
       if 'Win' in self.builder_name:
         self.checkout_root = self.make_path('C:\\', 'b', 'work')
         self.gclient_cache = self.make_path('C:\\', 'b', 'cache')
       else:
         self.checkout_root = self.make_path('/', 'b', 'work')
         self.gclient_cache = self.make_path('/', 'b', 'cache')
 
       # got_revision is filled in after checkout steps.
       self.got_revision = None
@@ skipping 89 matching lines @@
       'TSAN',
       'UBSAN',
       'Valgrind',
     ]
     upload_perf_results = True
     for s in skip_upload_bots:
       if s in self.m.properties['buildername']:
         upload_perf_results = False
         break
     return upload_perf_results