Add a CQ tester (which will start as experimental) with N5's on L.

masters/master.tryserver.chromium.linux/slaves.cfg

 # -*- python -*-
 # ex: set syntax=python:
 # Copyright 2014 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.
 
 def linux():
   linux_arm_testers = [9]
@@ skipping 169 matching lines @@
       'master': 'TryServerChromiumLinux',
       'builder': ['android_dbg_tests_recipe',
                   'android_rel_tests_recipe',
                   'android_fyi_dbg_tests_recipe',
                   'linux_android_dbg_ng',
                   'linux_android_rel_ng'],
       'hostname': 'build%d-a4' % i,
       'os': 'linux',
       'version': 'precise',
       'bits': '64',
-    } for i in range(100,139+1)
+    } for i in range(100,138+1)
   ]
 
   amp_slaves = [
     {
       'master': 'TryServerChromiumLinux',
       'builder': 'android_amp_rel_tests_recipe',
       'hostname': 'build%d-a95' % i,
       'os': 'linux',
       'version': 'precise',
       'bits': '64',
     } for i in (17, 18, 30, 40, 48, 61)
   ]
 
   aosp_slaves = [
     {
       'master': 'TryServerChromiumLinux',
       'builder': 'android_aosp',
       'hostname': 'slave%d-c4' % i,
       'os': 'linux',
       'version': 'precise',
       'bits': '64',
     } for i in range(520, 540)
   ]
 
-  return compile_slaves + test_slaves + amp_slaves + aosp_slaves
+  n5_experiment = [
+    {
+      'master': 'TryServerChromiumLinux',
+      'builder': 'android_n5_rel_tests_recipe',
+      'hostname': 'build139-a4',
+      'os': 'linux',
+      'version': 'precise',
+      'bits': '64',
+    }
+  ]
+
+  return compile_slaves + test_slaves + amp_slaves + aosp_slaves + n5_experiment
 
 
 slaves = linux() + android()