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Reading the keyboard device layout property from udev might fail. When
this happens, we used to store the keyboard info with a default layout
value = Layout1.

This CL avoid storing the keyboard info when a failure in udev is detected,
we will still fallback to the default layout for the current key event, but
we will attempt to re-read the layout property from udev on subsequent keys
until a valid layout is returned. This eliminates the need to reboot the
device to exit the bad state.

BUG=783166
TEST=added new test.

Change-Id: I94d6771ef955e20cee831ad0a93e31dcaaf8f610
Reviewed-on: https://chromium-review.googlesource.com/764444Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516063}