Valgrind/Heapchecker: Only run presubmit check on suppression files.

tools/valgrind/memcheck/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.
 
 """
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details on the presubmit API built into gcl.
 """
 
+import re
+
 def CheckChange(input_api, output_api):
   """Checks the memcheck suppressions files for bad data."""
+  sup_regex = re.compile('suppressions.*\.txt$')
   suppressions = {}
   errors = []
   check_for_memcheck = False
   # skip_next_line has 3 possible values:
   # - False: don't skip the next line.
   # - 'skip_suppression_name': the next line is a suppression name, skip.
   # - 'skip_param': the next line is a system call parameter error, skip.
   skip_next_line = False
-  for f in filter(lambda x: x.LocalPath().endswith('.txt'),
+  for f in filter(lambda x: sup_regex.search(x.LocalPath()),
                   input_api.AffectedFiles()):
     for line, line_num in zip(f.NewContents(),
                               xrange(1, len(f.NewContents()) + 1)):
       line = line.lstrip()
       if line.startswith('#') or not line:
         continue
 
       if skip_next_line:
         if skip_next_line == 'skip_suppression_name':
           if suppressions.has_key(line):
@@ skipping 35 matching lines @@
   return []
 
 def CheckChangeOnUpload(input_api, output_api):
   return CheckChange(input_api, output_api)
 
 def CheckChangeOnCommit(input_api, output_api):
   return CheckChange(input_api, output_api)
 
 def GetPreferredTrySlaves():
   return ['linux_valgrind', 'mac_valgrind']