Bookmark Sync in Chromium landed a few days ago and today sees the turn of Google Chrome Unstable gaining this feature with the latest dev channel update.

As with Chromium you simply need to add the 
  • –enable-sync
flag to your launcher. Like so: –

and the bookmark dialog will become active.

You need to enter your Google account details for the sync to work (it uses Google Docs to store the bookmarks.)