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This CL ensures that current focused annotation is scrolled into view
if not already in view on key events. This ensures that user can see the
annotation in the viewport while performing key events on the same.

Bug: 1085614
Change-Id: I41162be9a096219e04682ec5240508819a5baf48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228250
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#776902}