[Mac] Touch Bar support for default browser window state

ui/gfx/vector_icons/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 
 action("aggregate_vector_icons") {
   visibility = [ ":*" ]
 
   script = "aggregate_vector_icons.py"
@@ skipping 14 matching lines @@
     "default_favicon.icon",
     "eol.icon",
     "error_circle.icon",
     "extension.icon",
     "extension_crashed.icon",
     "file_download.icon",
     "file_download_incognito.1x.icon",
     "file_download_incognito.icon",
     "file_download_shelf.icon",
     "fullscreen.icon",
+    "g_search.icon",
     "globe.icon",
     "help_outline.icon",
     "image.icon",
     "info_outline.icon",
     "location_on.icon",
     "lock.icon",
     "media_router_active.icon",
     "media_router_error.icon",
     "media_router_idle.icon",
     "media_router_warning.icon",
@@ skipping 59 matching lines @@
     "../vector_icon_types.h",
     "../vector_icons_public.h",
   ]
 
   deps = [
     ":aggregate_vector_icons",
     "//base",
     "//skia",
   ]
 }