It is time.

ui/ozone/ozone.gni

-# Copyright 2014 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.
-
-declare_args() {
-  # Select platforms automatically. Turn this off for manual control.
-  ozone_auto_platforms = true
-}
-
-declare_args() {
-  # The platform that will be active by default.
-  ozone_platform = ""
-
-  # Enable individual platforms.
-  ozone_platform_caca = false
-  ozone_platform_dri = false
-  ozone_platform_egltest = false
-  ozone_platform_gbm = false
-  ozone_platform_test = false
-
-  if (ozone_auto_platforms) {
-    # Use test as the default platform.
-    ozone_platform = "test"
-
-    # Build all platforms whose deps are in install-build-deps.sh.
-    # Only these platforms will be compile tested by buildbots.
-    ozone_platform_dri = true
-    ozone_platform_test = true
-    ozone_platform_egltest = true
-  }
-}