This is the same command as share-on-reader, only it is made to work with the https version of Google Reader. Read the blog entry about it
CmdUtils.makeBookmarkletCommand({
name: "share-on-reader-secure",
url: "javascript:var%20b=document.body;var%20GR________bookmarklet_domain='https://www.google.com';if(b&&!document.xmlVersion){void(z=document.createElement('script'));void(z.src='https://www.google.com/reader/ui/link-bookmarklet.js');void(b.appendChild(z));}else{}"
});