Copy InputType.{cpp,h} to InputTypeUI.{cpp,h}.

This is a preparation to split InputType class into two.

BUG=274205
R=yosin@chromium.org

Review URL: https://codereview.chromium.org/22929027

git-svn-id: svn://svn.chromium.org/blink/trunk@156541 bbb929c8-8fbe-4397-9dbb-9b2b20218538