Run json_schema_compiler unit tests via a PRESUBMIT check.

tools/json_schema_compiler/PRESUBMIT.py

Index: tools/json_schema_compiler/PRESUBMIT.py
diff --git a/tools/json_schema_compiler/PRESUBMIT.py b/tools/json_schema_compiler/PRESUBMIT.py
new file mode 100644
index 0000000000000000000000000000000000000000..b98649b3b4b83ca452c9cecd20d750ffa5c19ab8
--- /dev/null
+++ b/tools/json_schema_compiler/PRESUBMIT.py
@@ -0,0 +1,20 @@
+# 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.
+
+"""Presubmit script for changes affecting tools/json_schema_compiler/
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into gcl.
+"""
+
+WHITELIST = [ r'.+_test.py$' ]
+
+def CheckChangeOnUpload(input_api, output_api):
+  return input_api.canned_checks.RunUnitTestsInDirectory(
+      input_api, output_api, '.', whitelist=WHITELIST)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return input_api.canned_checks.RunUnitTestsInDirectory(
+      input_api, output_api, '.', whitelist=WHITELIST)