Add tools/checkperms/ from the chromium repo

tools/checkperms/PRESUBMIT.py

Index: tools/checkperms/PRESUBMIT.py
diff --git a/testing/PRESUBMIT.py b/tools/checkperms/PRESUBMIT.py
similarity index 66%
copy from testing/PRESUBMIT.py
copy to tools/checkperms/PRESUBMIT.py
index 90e524f455c63ad21f3064cff4ab95c36358ccbb..c2f93567da3d9f65afc0d5d43a3f9bda3a30ba6b 100644
--- a/testing/PRESUBMIT.py
+++ b/tools/checkperms/PRESUBMIT.py
@@ -2,7 +2,7 @@
 # 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 testing.
+"""Top-level presubmit script for checkperms.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into gcl.
@@ -11,9 +11,11 @@ details on the presubmit API built into gcl.
 
 def CommonChecks(input_api, output_api):
   output = []
-  blacklist = [r'gmock.*', r'gtest.*']
-  output.extend(input_api.canned_checks.RunPylint(
-      input_api, output_api, black_list=blacklist))
+  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