[VwG] Add "Refresh" button to sample app to refresh tokens. - #453

[VwG] Add "Refresh" button to sample app to refresh tokens.#453

brnnmrls merged 6 commits into

briannamorales/vwg-flowgoogle/GoogleSignIn-iOS:briannamorales/vwg-flowfrom

briannamorales/refreshTokensButtongoogle/GoogleSignIn-iOS:briannamorales/refreshTokensButtonCopy head branch name to clipboard