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This CL calls the GetMatchingVisualTargets in a worker thread, since
the process of scoring visual features takes longer than expected
and was blocking interaction.

Fixed: 1121375
Change-Id: I8f3e33d20f812645a72adfc16fe33241b49a6ff4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372869
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801907}