Handle other users of the history nav API
Handle other users of the history nav API

Mark our frames and ignore others.

Sometimes need to clobber other frames, but if users are behaving
correctly this is safe.  Added commentary to this effect.

doug-wade/react-server,emecell/react-server,davidalber/react-server,emecell/react-server,szhou8813/react-server,doug-wade/react-server,davidalber/react-server,lidawang/react-server,szhou8813/react-server,lidawang/react-server,redfin/react-server,redfin/react-server