Add --force as a synonym for --no_presubmit as per Nicolas' request.

tests/gcl_unittest.py

Index: tests/gcl_unittest.py
diff --git a/tests/gcl_unittest.py b/tests/gcl_unittest.py
index 2e9b3bea0efe67019c86eeb5341c21807d750e46..674b68cc9cf7a0ba55ed136c58fe4202a23214de 100755
--- a/tests/gcl_unittest.py
+++ b/tests/gcl_unittest.py
@@ -42,15 +42,16 @@ class GclUnittest(GclTestsBase):
     members = [
       'CODEREVIEW_SETTINGS', 'CODEREVIEW_SETTINGS_FILE', 'CPP_EXTENSIONS',
       'Change', 'ChangeInfo', 'Changes', 'Commit', 'DoPresubmitChecks',
-      'ErrorExit', 'FILES_CACHE', 'GenerateChangeName', 'GenerateDiff',
+      'ErrorExit', 'FILES_CACHE', 'FilterFlag', 'GenerateChangeName',
+      'GenerateDiff',
       'GetCacheDir', 'GetCachedFile', 'GetChangesDir', 'GetCLs',
       'GetChangelistInfoFile', 'GetCodeReviewSetting', 'GetEditor',
       'GetFilesNotInCL', 'GetInfoDir', 'GetIssueDescription',
       'GetModifiedFiles', 'GetRepositoryRoot',
       'GetSVNFileProperty', 'Help', 'IGNORE_PATHS', 'IsSVNMoved',
       'Lint', 'LoadChangelistInfoForMultiple',
-      'MISSING_TEST_MSG', 'Opened', 'PresubmitCL', 'ReadFile',
-      'REPOSITORY_ROOT', 'RunShell',
+      'MISSING_TEST_MSG', 'Opened', 'OptionallyDoPresubmitChecks',
+      'PresubmitCL', 'ReadFile', 'REPOSITORY_ROOT', 'RunShell',
       'RunShellWithReturnCode', 'SendToRietveld', 'TryChange',
       'UnknownFiles', 'UploadCL', 'Warn', 'WriteFile',
       'gclient', 'getpass', 'main', 'os', 'random', 're',