GN: Work on Linux build defines

build/gyp_chromium

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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 script is wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
@@ skipping 189 matching lines @@
   remap_cases = [
       ('android_webview_build', '1', 'is_android_webview_build=true'),
       ('branding', 'Chrome', 'is_chrome_branded=true'),
       ('build_for_tool', 'drmemory', 'disable_iterator_debugging=true'),
       ('build_for_tool', 'tsan', 'disable_iterator_debugging=true'),
       ('buildtype', 'Official', 'is_official_build=true'),
       ('component', 'shared_library', 'is_component_build=true'),
       ('clang', '1', 'is_clang=true'),
       ('clang_use_chrome_plugins', '0', 'clang_use_chrome_plugins=false'),
       ('disable_glibcxx_debug', '1', 'disable_iterator_debugging=true'),
+      ('enable_mdns', '0', 'enable_mdns=false'),
+      ('enable_mdns', '1', 'enable_mdns=true'),
+      ('enable_plugins', '0', 'enable_plugins=false'),
+      ('enable_plugins', '1', 'enable_plugins=true'),
       ('target_arch', 'ia32', 'cpu_arch="x86"'),
       ('target_arch', 'x64', 'cpu_arch="x64" force_win64=true'),
       ('target_arch', 'arm', 'cpu_arch="arm"'),
       ('target_arch', 'mipsel', 'cpu_arch="mipsel"'),
       ('fastbuild', '0', 'symbol_level=2'),
       ('fastbuild', '1', 'symbol_level=1'),
       ('fastbuild', '2', 'symbol_level=0'),
       ('OS', 'ios', 'os="ios"'),
       ('OS', 'android', 'os="android"'),
       ('chromeos', '1', 'os="chromeos"'),
       ('use_aura', '1', 'use_aura=true'),
       ('use_goma', '1', 'use_goma=true'),
+      ('use_openssl', '0', 'use_openssl=false'),
+      ('use_openssl', '1', 'use_openssl=true'),
       ('asan', '1', 'is_asan=true'),
       ('lsan', '1', 'is_lsan=true'),
       ('msan', '1', 'is_msan=true'),
       ('tsan', '1', 'is_tsan=true'),
   ]
   for i in remap_cases:
     if i[0] in vars_dict and vars_dict[i[0]] == i[1]:
       gn_args += ' ' + i[2]
 
   # These string arguments get passed directly as GN strings.
@@ skipping 264 matching lines @@
   # rather than a separate runhooks step so that any environment modifications
   # from above are picked up.
   print 'Running build/landmines.py...'
   subprocess.check_call(
       [sys.executable, os.path.join(script_dir, 'landmines.py')])
 
   if vs2013_runtime_dll_dirs:
     CopyVsRuntimeDlls(GetOutputDirectory(), vs2013_runtime_dll_dirs)
 
   sys.exit(gyp_rc)