Add a few missing dependencies of ChromeOS GN builds.

chrome/browser/chromeos/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/features.gni")
 import("//build/config/ui.gni")
 import("//components/nacl/nacl_defines.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 84 matching lines @@
     "//third_party/libusb",
     "//third_party/libxml",
     "//third_party/npapi",
     "//third_party/protobuf:protobuf_lite",
     "//third_party/protobuf:protoc($host_toolchain)",
     "//third_party/re2",
     "//third_party/zlib",
     "//ui/app_list",
     "//ui/aura",
     "//ui/base",
+    "//ui/chromeos:ui_chromeos",
     "//ui/compositor",
     "//ui/display",
     "//ui/events/platform",
     "//ui/events:dom4_keycode_converter",
     "//ui/file_manager",
     "//ui/message_center",
     "//ui/surface",
     "//ui/views",
     "//ui/views/controls/webview",
     "//ui/web_dialogs",
@@ skipping 48 matching lines @@
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
     "attestation/attestation_signed_data.proto",
   ]
 }