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The current threshold is LOW which corresponds to any non-zero score. This will cause any site with a non-zero engagement score to be ignored from lookalike suggestions.

The effect of this change is:
- The navigated site will be more likely to be considered for a lookalike suggestion
- The navigated site will be compared to fewer engaged sites

Bug: 878153
Change-Id: I19928398b207d36981736ed22e6a026263f93751
Reviewed-on: https://chromium-review.googlesource.com/c/1334851Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608067}