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Search for item.title and item.hostname using weighted search from
fuse.js. Scores are calculated from matching item.title and item.hostname.
Items are sorted by scores by desc so better matching items will show up
first. Also extract item.hostname from item.url.

Bug: 1099917
Change-Id: Ieaee008b778dda90ef08ed504da034080b71cc58
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chrome/browser/resources/tab_search/+/3222931Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Tom Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819594}