[omnibox] Limit fuzzy match processing & add fuzzy sub-provider metrics
This CL does two things:
- Reduces the number of matches converted from each fuzzy match source
provider (sub-provider) to max one.
- Records histogram conversion counts for each sub-provider:
Omnibox.FuzzyMatchConversion.{SubProvider}
Bug: 1286859
Change-Id: Ia5943b4f4abd9d1c16521b542ed8fd8182ddf08d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3739046
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1022797}
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