Add a note about false positives on "copyright" word into licenses checker

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 79 matching lines @@
   # Flatten out the result
   offending_files = \
     [item for sublist in offending_files_chunks for item in sublist]
 
   (unknown, missing, stale) = copyright_scanner.AnalyzeScanResults(
     input_api, whitelisted_files, offending_files)
 
   if unknown:
     print 'The following files contain a third-party license but are not in ' \
           'a listed third-party directory and are not whitelisted. You must ' \
-          'add the following files to the whitelist.\n%s' % \
+          'add the following files to the whitelist.\n' \
+          '(Note that if the code you are adding does not actually contain ' \
+          'any third-party code, it may contain the word "copyright", which ' \
+          'should be masked out, e.g. by writing it as "copy-right")\n%s' % \
           '\n'.join(sorted(unknown))
   if missing:
     print 'The following files are whitelisted, but do not exist.\n%s' % \
-        '\n'.join(sorted(missing))
+          '\n'.join(sorted(missing))
   if stale:
     print 'The following files are whitelisted unnecessarily. You must ' \
           'remove the following files from the whitelist.\n%s' % \
           '\n'.join(sorted(stale))
 
   if unknown:
     code = ScanResult.Errors
   elif stale or missing:
     code = ScanResult.Warnings
   else:
@@ skipping 175 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())