[metrics] Add new auth metric

Bug: b/358442026
Change-Id: If91494b52fe27177f68e42ec40977fd8ca1fd4cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5786166
Commit-Queue: Allen Li <ayatane@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>

metrics.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 # Copyright (c) 2018 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.
@@ -16,6 +15,7 @@ import urllib.request
 import detect_host_arch
 import gclient_utils
 import metrics_utils
+import newauth
 import subprocess2
 import utils
 
@@ -251,6 +251,18 @@ class MetricsCollector(object):
         if bot_metrics:
             self.add('bot_metrics', bot_metrics)
 
+        # TODO(b/347085702): Remove this variable when dogfood is over.
+        new_auth_enabled = 'DEFAULT'
+        if newauth.Enabled():
+            new_auth_enabled = 'TRUE'
+        elif newauth.ExplicitlyDisabled():
+            new_auth_enabled = 'FALSE'
+        if new_auth_enabled != 'DEFAULT':
+            self.add_repeated('env_vars', {
+                'name': 'DOGFOOD_NEW_AUTH',
+                'value': new_auth_enabled,
+            })
+
         self._upload_metrics_data()
         if exception:
             gclient_utils.reraise(exception[0], exception[1], exception[2])