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The newly-introduced metrics explore different predicates to determine
whether a bookmark is a duplicate. These variants are more strict and
involve not only URL equality, but also title equality and (in a
separate metric) parent equality.

Change-Id: I8ac7ce46b235e31ec855d55fcc5bf0cad8ef9fff
Bug: 1068378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514155Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824004}