Draw underlay behind android apps using talkback

components/exo/BUILD.gn

 # Copyright 2015 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/ui.gni")
 import("//testing/test.gni")
 
 source_set("exo") {
   sources = [
     "buffer.cc",
@@ skipping 45 matching lines @@
     "//skia",
     "//ui/aura",
     "//ui/compositor",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/views",
     "//ui/views/mus",
     "//ui/wm:wm",
   ]
+
+  if (is_chromeos) {
+    deps += [ "//chromeos" ]
+  }
 }
 
 source_set("test_support") {
   testonly = true
 
   sources = [
     "test/exo_test_base.cc",
     "test/exo_test_base.h",
     "test/exo_test_helper.cc",
     "test/exo_test_helper.h",
@@ skipping 80 matching lines @@
   ]
 
   if (use_x11) {
     deps += [ "//tools/xdisplaycheck" ]
   }
 
   if (is_linux) {
     deps += [ "//components/exo/wayland:unit_tests" ]
   }
 }