libyuv: Add GN bots for Win,Mac,Linux,Android

masters/master.tryserver.libyuv/slaves.cfg

 # 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.
 
 slaves = [
   # Linux.
   {
     'master': 'LibyuvTryServer',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
     'builder': [
       'linux',
       'linux_rel',
+      'linux_gn',
+      'linux_gn_rel',
       'linux_asan',
       'linux_memcheck',
       'linux_msan',
       'linux_tsan2',
       'linux_ubsan',
       'linux_ubsan_vptr',
       'android',
       'android_rel',
+      'android_gn',
+      'android_gn_rel',
       'android_clang',
       'android_arm64',
     ],
     'hostname': 'slave%d-c4' % i,
   } for i in xrange(498, 500)
 ] + [
   # Mac.
   {
     'master': 'LibyuvTryServer',
     'os': 'mac',
     'version': '10.8',
     'bits': '64',
     'builder': [
       'mac',
       'mac_rel',
+      'mac_gn',
+      'mac_gn_rel',
       'mac_asan',
       'ios',
       'ios_rel',
       'ios_arm64',
       'ios_arm64_rel',
     ],
     'hostname': 'vm749-m4',
   },
 ] + [
   # Windows.
   {
     'master': 'LibyuvTryServer',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'win',
       'win_rel',
       'win_x64_rel',
+      'win_x64_gn',
+      'win_x64_gn_rel',
       'win_clang',
       'win_clang_rel',
       'win_x64_clang_rel',
     ],
     'hostname': 'vm789-m4',
   }
 ]