Bug 157846. Main patch: Propagate text <input> padding down to its scrolled child and add 1px left/right padding to stylesheets as needed. Fix tests. r=roc
Original patch by Charly Molter. Help from Robert O'Callahan and Jim Mathies.

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extra : rebase_source : eacfe5696e9831f149157bbd7fe697c0f8020604