Add khronos_glcts_test to both_gn_and_gyp target

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 128 matching lines @@
   if (!is_ios && !is_android && !is_chromecast) {
     deps += [
       "//chrome",
       "//chrome/test:browser_tests",
       "//chrome/test:interactive_ui_tests",
       "//chrome/test:sync_integration_tests",
       "//chrome/test/chromedriver:chromedriver_unittests",
       "//extensions:extensions_browsertests",
       "//extensions:extensions_unittests",
       "//gpu/gles2_conform_support:gles2_conform_test",
+      "//gpu/khronos_glcts_support:khronos_glcts_test",
       "//jingle:jingle_unittests",
       "//net:hpack_example_generator",
       "//net:hpack_fuzz_mutator",
       "//net:hpack_fuzz_wrapper",
       "//ppapi:ppapi_unittests",
       "//ppapi/examples/2d",
       "//ppapi/examples/audio",
       "//ppapi/examples/audio_input",
       "//ppapi/examples/compositor",
       "//ppapi/examples/crxfs",
@@ skipping 785 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }