I don't know about following feature of google chrome.
If you use google chrome you might already know about how to use pinned tabs.
Which gives extra space for other tabs. The pinned tab automatically goes to the left side on tab bar.
I use them for websites I use most. Examples are Google mail, calender, docs, facebook, twitter etc.
If you drag and drop the regular tab in between or left side of pinned tabs it automatically becomes pinned tab.
I don't know about it, found it accedentally.
-- Anil