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This adds an optional waiting step for the ShowCast
action to ensure the element is stable before trying
to scroll to it.

This change also makes ElementPositionGetter configurable
in terms of rounds and interval.

This change also removes the settings from WebController
as they are no longer needed.

Bug: b/172334699
Change-Id: I5ffd532c5c7ae8eab4b5d0809d17d6fec9b82749
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532293
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826440}