[tools] Clean up presubmit and run all unittests

NOTRY=true

Bug: v8:8763
Change-Id: I9b4e2edbb5f1eeeaa88d35efaa25a4eb0c35c95c
Reviewed-on: https://chromium-review.googlesource.com/c/1449612
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59279}

tools/PRESUBMIT.py

@@ -4,5 +4,5 @@
 
 def CheckChangeOnCommit(input_api, output_api):
   tests = input_api.canned_checks.GetUnitTestsInDirectory(
-      input_api, output_api, 'unittests')
+      input_api, output_api, 'unittests', whitelist=[r'.+_test\.py$'])
   return input_api.RunTests(tests)

tools/testrunner/PRESUBMIT.py

@@ -2,9 +2,17 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+def _CommonChecks(input_api, output_api):
+  return input_api.RunTests(input_api.canned_checks.GetUnitTestsRecursively(
+      input_api,
+      output_api,
+      input_api.os_path.join(input_api.PresubmitLocalPath()),
+      whitelist=[r'.+_unittest\.py$'],
+      blacklist=[],
+  ))
+
+def CheckChangeOnUpload(input_api, output_api):
+  return _CommonChecks(input_api, output_api)
+
 def CheckChangeOnCommit(input_api, output_api):
-  tests = input_api.canned_checks.GetUnitTestsInDirectory(
-      input_api, output_api, '../unittests', whitelist=['run_tests_test.py$'])
-  tests += input_api.canned_checks.GetUnitTestsInDirectory(
-    input_api, output_api, 'testproc', whitelist=['variant_unittest.py$'])
-  return input_api.RunTests(tests)
+  return _CommonChecks(input_api, output_api)