internet browsers like chrome, how will i save all the data and transfer it when i upgrade to windows 10

[c=7700B2][i]all the tabs i have in chrome now, all my bookmarks, history, and extensions? i presently have windows 7 and are gonna have to upgrade to win 10 very soon, so how will i transfer it all over? or what should i tell the computer shop man who will be upgrading my desktop computer to windows 10?

i'm anxious because i don't want to lose anything. i have an awful lot of data.[/i][/c]