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Autoclick menu icons should not be mirrored in RTL languages because
they have a directionality: The click types correspond to mouse buttons
left and right, and the positions correspond to corners of the screen.

Also adds a default screen position. This will be the same as where
the volume and brightness sliders show up on the screen in LTR/RTL
languages, and change with language direction. However, as soon as the
user explicitly picks another position using the autoclick menu
position button, the position will be fixed no matter if the user
changes their system language direction.
See go/chromeos-dwell-menu-design under the "Positioning" subheading.

Bug: 958998
Change-Id: I28b3bf44b1f9081d6709e0b8255913f69ccac3c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594654
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657375}