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When a user fine tunes their capture region, it's useful to have more
precision. This CL adds a magnifying glass to the capture region to
address this.

Test: manual + added test.
Fixed: 1133751
Change-Id: I24f9652d1f97b2fbf29da6b771c6cc465b36d4dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453772
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816601}