Don't issue try jobs for OWNERS-only changes.

PRESUBMIT.py

 # 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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 811 matching lines @@
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasDescription(
       input_api, output_api))
   results.extend(_CheckSubversionConfig(input_api, output_api))
   return results
 
 
 def GetPreferredTrySlaves(project, change):
   files = change.LocalPaths()
 
-  if not files:
+  if not files or all(re.search(r'[\\/]OWNERS$', f) for f in files):

[M-A Ruel, 2013/01/10 22:42:59]

What about doing a whitelist instead?

We currently have one in presubmit_support.py as InputApi.DEFAULT_WHITE_LIST but
it's not available in this context. The list also has a glarring ommision: .gyp
and .gypi. On the other side, I don't think it's worth sending a try job for an
.html or .css only change.

What do you think?

     return []
 
   if all(re.search('\.(m|mm)$|(^|[/_])mac[/_.]', f) for f in files):
     return ['mac_rel', 'mac_asan']
   if all(re.search('(^|[/_])win[/_.]', f) for f in files):
     return ['win_rel']
   if all(re.search('(^|[/_])android[/_.]', f) for f in files):
     return ['android_dbg', 'android_clang_dbg']
   if all(re.search('^native_client_sdk', f) for f in files):
     return ['linux_nacl_sdk', 'win_nacl_sdk', 'mac_nacl_sdk']
@@ skipping 15 matching lines @@
       'win_aura',
       'win_rel',
   ]
 
   # Match things like path/aura/file.cc and path/file_aura.cc.
   # Same for chromeos.
   if any(re.search('[/_](aura|chromeos)', f) for f in files):
     trybots += ['linux_chromeos_clang:compile', 'linux_chromeos_asan']
 
   return trybots