Enable overlay scrollbars on ChromeOS

content/test/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")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 698 matching lines @@
     "//ui/accessibility:ax_gen",
     "//ui/base:test_support",
     "//ui/base/ime",
     "//ui/compositor",
     "//ui/display",
     "//ui/events:test_support",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/gl:test_support",
+    "//ui/native_theme",
     "//ui/resources",
     "//ui/shell_dialogs",
     "//ui/snapshot",
   ]
 
   data = []
 
   data_deps = [
     "//content/shell:pak",
     "//third_party/mesa:osmesa",
@@ skipping 979 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }