Add LogDog Python client library.

client/PRESUBMIT.py

 # Copyright 2012 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 """Top-level presubmit script for swarm_client.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into gcl.
 """
 
@@ skipping 12 matching lines @@
     ] + sys.path
     output.extend(input_api.canned_checks.RunPylint(input_api, output_api))
   finally:
     sys.path = sys_path_backup
 
   # These tests are touching the live infrastructure. It's a pain if your IP
   # is not whitelisted so do not run them for now. They should use a local fake
   # web service instead.
   blacklist = [
     r'.*isolateserver_smoke_test\.py$',
+    r'.*isolateserver_load_test\.py$',
     r'.*swarming_smoke_test\.py$',
   ]
   if not input_api.is_committing:
     # Remove all slow tests, e.g. the ones that take >1s to complete.
     blacklist.extend([
       r'.*isolate_smoke_test\.py$',
       r'.*trace_inputs_smoke_test\.py$',
       r'.*url_open_timeout_test\.py$',
     ])
 
-  output.extend(
-      input_api.canned_checks.RunUnitTestsInDirectory(
-          input_api, output_api,
-          input_api.os_path.join(input_api.PresubmitLocalPath(), 'tests'),
-          whitelist=[r'.+_test\.py$'],
-          blacklist=blacklist))
+  unit_tests = input_api.canned_checks.GetUnitTestsRecursively(
+      input_api, output_api,
+      input_api.os_path.join(input_api.PresubmitLocalPath()),
+      whitelist=[r'.+_test\.py$'],
+      blacklist=blacklist)
+  output.extend(input_api.RunTests(unit_tests))
   return output
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return CommonChecks(input_api, output_api)