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Previously, the entry point view for the Assistant proactive suggestions
feature would be presented to the user as soon as possible.

Now, with the addition of |show-on-scroll|, which is
|ENABLED_BY_DEFAULT|, the entry point view for the feature will show/
hide in response to the user's vertical scroll activity in the source
web contents.

This will reduce overall triggering of the feature but hypothetically
increase click through as the entry point is now being presented at a
more helpful and appropriate time.

Bug: b:142144655
Change-Id: I538e618af55d7ed3f0ab0480c300d9529893d03f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918662Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#715920}