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This CL updates the logic of handling click events and passes all the
events to Chrome side at first. The chrome side may defer or cancel
the user action and pass back the action to Android side.

This CL also contains the mojo changes which is related with the lock
screen notification and not directy related with defering.

ARC-side: ag/4764629
Chromium-side: crrev.com/c/1174143

Bug: b/79951342
Test: Manual
Change-Id: I42f9953029867d8e46124ba087a4f84a49fae99d
Reviewed-on: https://chromium-review.googlesource.com/c/1174143
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Eliot Courtney <edcourtney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601526}