WebRTC: Add new Linux (more configs) bots.

masters/master.client.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 64-bit.
   {
     'master': 'WebRTC',
     'os': 'linux',
     'version': 'trusty',
@@ skipping 16 matching lines @@
       'Linux64 Debug',
       'Linux64 Release',
       'Linux64 Debug (GYP)',
       'Linux64 Release (GYP)',
       'Linux64 Release (Libfuzzer)',
       'Linux Asan',
       'Linux MSan',
       'Linux Tsan v2',
       'Linux UBSan',
       'Linux UBSan vptr',
+      'Linux (more configs)',
     ],
     'hostname': 'slave%d-c3' % i,
   } for i in range(6, 10) + range(13, 21)
 ] + [
   {
     'master': 'WebRTC',
     'os': 'linux',
     'version': 'trusty',
     'bits': '64',
     'builder': [
@@ skipping 77 matching lines @@
     'master': 'WebRTC',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'Win32 Release [large tests]',
     ],
     'hostname': 'build20-b3',
   }
 ]