Build public cast_shell on x86 with GN.

ui/ozone/platform/egltest/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("//tools/generate_library_loader/generate_library_loader.gni")
 import("//ui/ozone/ozone.gni")
 
 source_set("egltest") {
   sources = [
     "ozone_platform_egltest.cc",
@@ skipping 26 matching lines @@
     "ShimDestroyWindow",
     "ShimGetNativeDisplay",
     "ShimGetNativeWindow",
     "ShimReleaseNativeWindow",
   ]
 }
 
 # TODO(spang): eglplatform_shim_x11 should become a loadable_module once
 # support lands: http://crbug.com/380327. Until then, it is not valid on
 # platforms other than Linux.
-
 # GYP version: "ui/ozone/platform/egltest/egltest.gypi:eglplatform_shim_x11"
 if (is_linux && ozone_platform_ozonex) {
   shared_library("eglplatform_shim_x11") {
     output_name = "libeglplatform_shim"
 
     output_extension = "so.1"
 
     sources = [
       "eglplatform_shim.h",
       "eglplatform_shim_xeleven.cc",
     ]
 
     configs += [ "//build/config/linux:x11" ]
   }
 }