WebRTC: Add new Linux (more configs) bots.

masters/master.tryserver.webrtc/slaves.cfg

 # 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.
 
 slaves = [
   # Linux.
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
     'version': 'trusty',
@@ skipping 23 matching lines @@
       'linux_gyp_rel',
       'linux_libfuzzer_rel',
       'linux_arm',
       'linux_asan',
       'linux_memcheck',
       'linux_msan',
       'linux_swarming',
       'linux_tsan2',
       'linux_ubsan',
       'linux_ubsan_vptr',
+      'linux_more_configs',
     ],
     'hostname': 'slave%d-c4' % i,
   } for i in range(719, 726) + range(837, 841) + range(1210, 1220)
 ] + [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
     'version': 'trusty',
     'bits': '64',
     'builder': [
@@ skipping 100 matching lines @@
     'master': 'WebRTCTryServer',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'win_baremetal',
     ],
     'hostname': hostname,
   } for hostname in ['build143-b4', 'build139-b4']
 ]