Collect license version as an optional_key in licenses.py

android_webview/tools/webview_licenses.py

 #!/usr/bin/python
 # Copyright 2014 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.
 
 """Checks third-party licenses for the purposes of the Android WebView build.
 
 The Android tree includes a snapshot of Chromium in order to power the system
 WebView.  This tool checks that all code uses open-source licenses compatible
 with Android, and that we meet the requirements of those licenses. It can also
@@ skipping 45 matching lines @@
     A list of directories.
   """
 
   result = []
   for directory in _FindThirdPartyDirs():
     if directory in known_issues.KNOWN_ISSUES:
       result.append(directory)
       continue
     try:
       metadata = licenses.ParseDir(directory, REPOSITORY_ROOT,
-                                   require_license_file=False)
+                                   require_license_file=False,
+                                   optional_keys=['License Android Compatible'])
     except licenses.LicenseError as e:
       print 'Got LicenseError while scanning ' + directory
       raise
     if metadata.get('License Android Compatible', 'no').upper() == 'YES':
       continue
     license = re.split(' [Ll]icenses?$', metadata['License'])[0]
     if not third_party.LicenseIsCompatibleWithAndroid(InputApi(), license):
       result.append(directory)
   return result
 
@@ skipping 285 matching lines @@
     files = sys.stdin.read().splitlines()
     for f, c in \
         zip(files, copyright_scanner.FindCopyrights(InputApi(), '.', files)):
       print f, '\t', ' / '.join(sorted(c))
     return ScanResult.Ok
   parser.print_help()
   return ScanResult.Errors
 
 if __name__ == '__main__':
   sys.exit(main())