Add All_syzygy target to GN build.

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 118 matching lines @@
       "//printing:printing_unittests",
       "//sql:sql_unittests",
       "//sync:sync_unit_tests",
       "//ui/base:ui_base_unittests",
       "//ui/gfx:gfx_unittests",
       "//ui/touch_selection:ui_touch_selection_unittests",
       "//ui/views:views_unittests",
       "//url:url_unittests",
     ]
   }
+
+  group("All_syzygy") {
+    if (is_syzyasan || syzygy_optimize) {
+      deps = [
+        "//chrome/installer/mini_installer:mini_installer",
+        "//chrome/installer/mini_installer:mini_installer_syzygy",
+      ]
+    }
+  }
 }
 
 if (is_chromeos) {
   group("chromiumos_preflight") {
     testonly = true
     deps = [
       "//breakpad:minidump_stackwalk($host_toolchain)",
       "//chrome",
       "//chrome/test/chromedriver",
       "//media:media_unittests",
@@ skipping 885 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }