Add PRESUBMIT.py to tools/sharding_supervisor/

tools/sharding_supervisor/PRESUBMIT.py

 # Copyright (c) 2012 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.
 
-"""Top-level presubmit script for checkperms.
+"""Top-level presubmit script for sharding_supervisor.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into gcl.
 """
 
-
 def CommonChecks(input_api, output_api):
   output = []
   output.extend(input_api.canned_checks.RunPylint(input_api, output_api))
-  # Run it like if it were a unit test.
-  output.extend(
-      input_api.canned_checks.RunUnitTests(
-          input_api, output_api, ['./checkperms.py']))
   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)
+  output = CommonChecks(input_api, output_api)
+  output.extend(input_api.canned_checks.PanProjectChecks(input_api, output_api))
+  return output