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This CL adds text to the nudge view and an inline icon to represent the
key to press to activate the keyboard shortcut. The icon shows as either
a search icon or a launcher icon, depending on what the device supports.
If the launcher icon is to be shown, then the icon is changed depending
on if assistant is available.

Bug: 1105541
Change-Id: Ieaad19c899af545f38410350ece2d30a48409a11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463869Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816375}