[build.webkit.org] Allow users to specify custom revision to checkout

https://bugs.webkit.org/show_bug.cgi?id=240307

Reviewed by Ryan Haddad.

* Tools/CISupport/build-webkit-org/factories.py:
(Factory.__init__):
* Tools/CISupport/build-webkit-org/loadConfig.py:
(loadBuilderConfig):
* Tools/CISupport/build-webkit-org/steps.py:
(CheckOutSpecificRevision):
(CheckOutSpecificRevision.__init__):
(CheckOutSpecificRevision.doStepIf):
(CheckOutSpecificRevision.hideStepIf):
(CheckOutSpecificRevision.start):
(ShowIdentifier.start):
(ShowIdentifier.evaluateCommand):

Canonical link: https://commits.webkit.org/250457@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294051 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Tools/CISupport/build-webkit-org/factories.py

@@ -1,4 +1,4 @@
-# Copyright (C) 2017-2021 Apple Inc. All rights reserved.
+# Copyright (C) 2017-2022 Apple Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -32,6 +32,7 @@ def __init__(self, platform, configuration, architectures, buildOnly, additional
         self.addStep(ConfigureBuild(platform=platform, configuration=configuration, architecture=" ".join(architectures), buildOnly=buildOnly, additionalArguments=additionalArguments, device_model=device_model))
         self.addStep(PrintConfiguration())
         self.addStep(CheckOutSource())
+        self.addStep(CheckOutSpecificRevision())
         self.addStep(ShowIdentifier())
         if not (platform == "jsc-only"):
             self.addStep(KillOldProcesses())