[Cronet] Enforce implementation does not call through API classes

components/cronet/PRESUBMIT.py

 # Copyright 2015 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 src/components/cronet.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
@@ skipping 53 matching lines @@
 
   if problems:
     return [output_api.PresubmitError(
         'API classes must be in org.chromium.net package, and implementation\n'
         'classes must not be in org.chromium.net package.',
         problems)]
   else:
     return []
 
 
+def _RunUnittests(input_api, output_api):
+  return input_api.canned_checks.RunUnitTestsInDirectory(
+      input_api, output_api, '.', [ r'^.+_unittest\.py$'])
+
+
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results.extend(_PyLintChecks(input_api, output_api))
   results.extend(
       input_api.canned_checks.CheckPatchFormatted(input_api, output_api))
   results.extend(_PackageChecks(input_api, output_api))
+  results.extend(_RunUnittests(input_api, output_api))
   return results
 
 
+def CheckChangeOnCommit(input_api, output_api):
+  return _RunUnittests(input_api, output_api)
+
+
 def _GetTryMasters(project, change):
   return {
     'master.tryserver.chromium.android': {
       'android_cronet_tester': [],
      },
   }
 
 
 def GetPreferredTryMasters(project, change):
   # TODO(nick, dcheng): Using the value of _GetTryMasters() instead of an empty
@@ skipping 21 matching lines @@
   new_description = description
   new_description += '\nCQ_INCLUDE_TRYBOTS=%s' % ';'.join(
       '%s:%s' % (master, ','.join(bots))
       for master, bots in masters.iteritems())
   results.append(output_api.PresubmitNotifyResult(
       'Automatically added Cronet trybot to run tests on CQ.'))
 
   rietveld_obj.update_description(issue, new_description)
 
   return results