[ios] Add support for filtering codesiging identity.

build/config/ios/find_signing_identity.py

 # Copyright (c) 2015 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.
 
 import argparse
 import os
 import subprocess
 import sys
 import re
 
 def ListIdentities():
   return subprocess.check_output([
     'xcrun',
     'security',
     'find-identity',
     '-v',
     '-p',
     'codesigning',
   ])
 
 
-def FindValidIdentity():
+def FindValidIdentity(identity_description):
   lines = list(map(str.strip, ListIdentities().splitlines()))
   # Look for something like "2) XYZ "iPhone Developer: Name (ABC)""
   exp = re.compile('[0-9]+\) ([A-F0-9]+) "([^"]*)"')
   for line in lines:
     res = exp.match(line)
     if res is None:
       continue
-    if "iPhone Developer" in res.group(2):
-      return res.group(1)
-  return ""
+    if identity_description in res.group(2):
+      yield res.group(1)
 
 
 if __name__ == '__main__':
   parser = argparse.ArgumentParser('codesign iOS bundles')
-  parser.add_argument('--developer_dir', required=False,
-                      help='Path to Xcode.')
+  parser.add_argument(
+      '--developer_dir', required=False,
+      help='Path to Xcode.')
+  parser.add_argument(
+      '--identity-description', required=True,
+      help='Text description used to select the code signing identity.')
   args = parser.parse_args()
   if args.developer_dir:
     os.environ['DEVELOPER_DIR'] = args.developer_dir
 
-  print FindValidIdentity()
+  for identity in FindValidIdentity(args.identity_description):
+    print identity