[chrome:omnibox] Add access keys for input elements.

Using L and F for query and find input boxes in order to be similar to
browser shortcuts for focusing the omnibox and find dialog respectively.

Using I, D, and P for 'show incomplete results', 'show details', and 'show per
provider' display checkboxes respectively.

Using C, A, and K for 'lock cursor', 'prevent autocomplete', 'keyword mode'
input checkboxes respectively.

Using U for 'current page' dropdown.

Bug: 891303
Change-Id: Id715fb6c3db5787a8e676f2497578128a2810fd9
Reviewed-on: https://chromium-review.googlesource.com/c/1372243
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615736}
2 files changed