Exclude third_party/crashpad from IPC presubmit

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 depot_tools.
 """
 
@@ skipping 1439 matching lines @@
       '*_messages*.h',
       '*_param_traits*.*',
       '*.mojom',
       '*_struct_traits*.*',
       '*_type_converter*.*',
       # Blink uses a different file naming convention
       '*StructTraits*.*',
       '*TypeConverter*.*',
   ]
 
+  # These third_party directories do not contain IPCs, but contain files
+  # matching the above patterns, which trigger false positives.
+  exclude_paths = [
+      'third_party/crashpad/*',
+  ]
+
   # Dictionary mapping an OWNERS file path to Patterns.
   # Patterns is a dictionary mapping glob patterns (suitable for use in per-file
   # rules ) to a PatternEntry.
   # PatternEntry is a dictionary with two keys:
   # - 'files': the files that are matched by this pattern
   # - 'rules': the per-file rules needed for this pattern
   # For example, if we expect OWNERS file to contain rules for *.mojom and
   # *_struct_traits*.*, Patterns might look like this:
   # {
   #   '*.mojom': {
@@ skipping 15 matching lines @@
 
   # Iterate through the affected files to see what we actually need to check
   # for. We should only nag patch authors about per-file rules if a file in that
   # directory would match that pattern. If a directory only contains *.mojom
   # files and no *_messages*.h files, we should only nag about rules for
   # *.mojom files.
   for f in input_api.change.AffectedFiles(include_deletes=False):
     for pattern in file_patterns:
       if input_api.fnmatch.fnmatch(
           input_api.os_path.basename(f.LocalPath()), pattern):
+        skip = False
+        for exclude in exclude_paths:
+          if input_api.fnmatch.fnmatch(f.LocalPath(), exclude):
+            skip = True
+            break
+        if skip:
+          continue
         owners_file = input_api.os_path.join(
             input_api.os_path.dirname(f.LocalPath()), 'OWNERS')
         if owners_file not in to_check:
           to_check[owners_file] = {}
         if pattern not in to_check[owners_file]:
           to_check[owners_file][pattern] = {
               'files': [],
               'rules': [
                   'per-file %s=set noparent' % pattern,
                   'per-file %s=file://ipc/SECURITY_OWNERS' % pattern,
@@ skipping 784 matching lines @@
   results.extend(input_api.canned_checks.CheckTreeIsOpen(
       input_api,
       output_api,
       json_url='http://chromium-status.appspot.com/current?format=json'))
 
   results.extend(input_api.canned_checks.CheckChangeHasBugField(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasDescription(
       input_api, output_api))
   return results