Add a chrome_official_syzyasan_builder target.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 132 matching lines @@
       "//printing:printing_unittests",
       "//sql:sql_unittests",
       "//ui/base:ui_base_unittests",
       "//ui/gfx:gfx_unittests",
       "//ui/touch_selection:ui_touch_selection_unittests",
       "//ui/views:views_unittests",
       "//url:url_unittests",
     ]
   }
 
+  # TODO(sebmarchand): Remove this once we stop supporting Syzygy (M54+).
   group("All_syzygy") {
     if (is_syzyasan || syzygy_optimize) {
       deps = [
         "//chrome/installer/mini_installer:mini_installer",
         "//chrome/installer/mini_installer:mini_installer_syzygy",
       ]
     }
   }
+
+  if (is_syzyasan) {
+    group("chrome_official_syzyasan_builder") {
+      deps = [
+        ":All_syzygy",
+        ":chrome_official_builder_no_unittests",
+      ]
+    }
+  }
 }
 
 if (is_chromeos) {
   group("chromiumos_preflight") {
     testonly = true
     deps = [
       "//breakpad:minidump_stackwalk($host_toolchain)",
       "//chrome",
       "//chrome/test/chromedriver",
       "//media:media_unittests",
@@ skipping 959 matching lines @@
       "//ui/display:display_unittests",
       "//ui/events:events_unittests",
       "//ui/gfx:gfx_unittests",
       "//ui/gl:gl_unittests",
       "//ui/keyboard:keyboard_unittests",
       "//ui/touch_selection:ui_touch_selection_unittests",
       "//url:url_unittests",
     ]
   }
 }