[gclient_scm] Add new auth stack setup to gclient

Bug: b/356935829
Change-Id: Ie917f142c3fddba398a5351d685a7b131b298a76
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5762791
Commit-Queue: Allen Li <ayatane@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>

gclient_scm.py

@@ -21,8 +21,10 @@ import traceback
 
 import gclient_utils
 import gerrit_util
+import git_auth
 import git_cache
 import git_common
+import newauth
 import scm
 import subprocess2
 
@@ -1321,6 +1323,10 @@ class GitWrapper(SCMWrapper):
         parent_dir = os.path.dirname(self.checkout_path)
         gclient_utils.safe_makedirs(parent_dir)
 
+        # Set up Git authentication configuration that is needed to clone/fetch the repo.
+        if newauth.Enabled():
+            git_auth.ConfigureGlobal('/', url)
+
         if hasattr(options, 'no_history') and options.no_history:
             self._Run(['init', self.checkout_path], options, cwd=self._root_dir)
             self._Run(['remote', 'add', 'origin', url], options)