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With this change, when TouchEventFilter restricts usage of the page to
some specified element, it also highlights these elements by graying out
the sections of the page that cannot be used. The color used for graying
out is the same as the one used for the overlay.
https://screenshot.googleplex.com/TX0MNV26coP.png

If the user taps 3 times within a 15s window, the message "Continue
Manually" appears in the snackbar, allowing 5s to decide to continue or
let Autofill Assistant shuts itself down.
https://screenshot.googleplex.com/zxYdR8i9JuO.png

This patch also lengthen the duration of the snackbar shown when closing
Autofill Assistant to 5s. And shortens the message shown after hitting
the back button, for example, to "I cannot help anymore, please continue
manually."

Bug: 806868
Change-Id: I6a31b31e6f8810b30b64e6a4060ca2fab117f5d1
Reviewed-on: https://chromium-review.googlesource.com/c/1328988
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606980}