Add 'ThinLTO Linux ToT' buildbot (recipes part).

masters/master.chromium.fyi/slaves.cfg

 # -*- python -*-
 # ex: set syntax=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.
 
 # See master.experimental/slaves.cfg for documentation.
 
 
@@ skipping 574 matching lines @@
     ],
     'hostname': 'slave20-c1',
     'os': 'linux',
     'version': 'trusty',
     'bits': '64',
   },
   {
     'master': 'ChromiumFYI',
     'builder': [
       'CFI Linux ToT',
+      'ThinLTO Linux ToT',
     ],
     'hostname': 'slave59-c1',
     'os': 'linux',
     'version': 'trusty',
     'bits': '64',
   },
   {
     'master': 'ChromiumFYI',
     'builder': [
       'CFI Linux CF',
@@ skipping 164 matching lines @@
       'master': 'ChromiumFYI',
       'builder': [
           'Chromium Win PGO Builder',
           'Chromium Win x64 PGO Builder',
       ],
       'hostname': slave,
       'os': 'win',
       'version': 'win7',
       'bits': '64',
   })