New preference: australian scrolling for mice

the new preference applies australian scrolling to traditional mice.

BUG=chromium:357794
TEST=use --mouse_australian_scrolling=1

Change-Id: Ic03d90830103e36048f6990fbe341eae94ed7366
Reviewed-on: https://chromium-review.googlesource.com/192183
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Dennis Kempin <denniskempin@chromium.org>
Commit-Queue: Dennis Kempin <denniskempin@chromium.org>
2 files changed