Add aura compile testing by default to likely areas.

PRESUBMIT.py

 # Copyright (c) 2011 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.
 """
 
 
+import re
+
+
 _EXCLUDED_PATHS = (
     r"^breakpad[\\\/].*",
     r"^net/tools/spdyshark/[\\\/].*",
     r"^skia[\\\/].*",
     r"^v8[\\\/].*",
     r".*MakeFile$",
 )
 
 
 _TEST_ONLY_WARNING = (
@@ skipping 306 matching lines @@
       input_api, output_api))
   results.extend(_CheckSubversionConfig(input_api, output_api))
   return results
 
 
 def GetPreferredTrySlaves(project, change):
   only_objc_files = all(
       f.LocalPath().endswith(('.mm', '.m')) for f in change.AffectedFiles())
   if only_objc_files:
     return ['mac']
-  return ['win', 'linux', 'mac']
+  preferred = ['win', 'linux', 'mac']

[M-A Ruel, 2011/12/09 21:51:40]

Note that it'll conflict with a CL from thakis where he changes these to _rel.

+  aura_re = '_aura[^/]*[.][^/]*'
+  if any(re.search(aura_re, f.LocalPath()) for f in change.AffectedFiles()):
+    preferred.append('linux_aura:compile')
+  return preferred