[omnibox] Ignore invalid duplicates in local history zero-suggest
Invalid duplicates are those search terms extracted from search query URLs which are identical or nearly identical to the original search query URL and issued too closely to it. They are typically recorded as a result of back/forward navigations or user interactions in the search result page and are likely not newly initiated searches. With frecency ranking, these duplicates must be ignored or they will erroneously boost those queries. For the purpose of local history ZPS, a duplicated query issued within 5 minutes of the original query is considered an invalid duplicate. Bug: 1108531,1096615 Change-Id: I7855c0b72ee47d7a55bc77315734e7e48c2df355 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337676Reviewed-by:Victor Costan <pwnall@chromium.org> Reviewed-by:
Mark Pearson <mpearson@chromium.org> Reviewed-by:
Scott Violet <sky@chromium.org> Commit-Queue: Moe Ahmadi <mahmadi@chromium.org> Cr-Commit-Position: refs/heads/master@{#800211}
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