Chrome Google Docs Extension (right click open with Google Docs on supported and editable file type...)
JavaScript
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pack
README
background.html
docs16.png
jquery.min.js
manifest.json
options.html
options.js

README

GNU LGPL
jQuery GPLv2/MIT

====

download the packed extension and open with/import it in Chrome/Chromium chrome://extensions/
https://github.com/pierriko/gdocs-context-ext/raw/master/pack/gdocs-context-ext.crx

====

Google Docs icon from:
http://docs.google.com/favicon.ico

dislike the menu in the official Google Docs extension:
https://chrome.google.com/extensions/detail/nnbmlagghjjcbdhgmkedmbmedengocbn

var pattern = new RegExp('^[^\\?#]+\\.(' + types.join('|') + ')((#|\\?).*)?$', 'i');
cf. 
http://code.google.com/chrome/extensions/match_patterns.html
http://code.google.com/chrome/extensions/contextMenus.html

===

try it with:
http://www.google.com/search?q=filetype:odt

===