Add JSON.pm to third_party

third_party/JSON/README.chromium

Index: third_party/JSON/README.chromium
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+Name: JSON - JSON (JavaScript Object Notation) encoder/decoder
+Short Name: JSON.pm
+URL: http://search.cpan.org/~makamaka/JSON-2.59/lib/JSON.pm
+Version: 2.59
+License: GPL v1 or later / Artistic License
+License File: NOT_SHIPPED
+Security Critical: no
+
+Description:
+This directory contains JSON.pm, used by Perl scripts at build time
+to read and write data in the JSON format.
+JSON.pm is included in Perl 5.14+ as a core module, but not in earlier
+versions, hence needed as separate module.
+
+Source: http://www.cpan.org/authors/id/M/MA/MAKAMAKA/JSON-2.59.tar.gz
+SHA-1: 8a82c442088ffa0d605747fd5e65f51e037aad94
+
+Local modifications:
+Contains both source and built module, together with a script to download
+archive, check SHA-1 hash, then (if ok) unarchive and build it.