Extension to Google Chrome browser that restarts Google Chrome
Type this into the omnibox (address bar):
chrome://restart
If you search the webstore, you’ll find at least one extension that can do it (at least according to the one person who reviewed it).
If you only want it in order to save your session, then you are asking the wrong question. It is not advisable to depend on Chrome’s crash-recovery to save your session because it is not always reliable. [1] [2]
You should use a proper session-management extension instead. A good one is Session Buddy which is very powerful, yet easy to use.