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This teaches event-rewriter about existence of external Chrome OS
branded keyboards. Because current Chrome OS keyboards are
indistinguishable from generic external USB/BT keyboards from HID
perspective, we rely on UDEV to tag relevant devices with
CROS_KEYBOARD_TOP_ROW_LAYOUT property.

This allows us to make Search->CapsLock and similar mappings work not
only for internal keyboards, but external Chrome OS keyboards as well.

OS keyboards.

Bug: b/144367328
Test: unit_tests, check that Caps lock remapping affects external Chrome
Change-Id: I0b3f932e108b43f7aafe51e155923c4f0b6b5975
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051211
Commit-Queue: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741122}