GitLab

Records preview-type-agnostic counts for: Previews.OptOut.UserOptedOut,
Previews.PageEndReason, and Previews.EligibilityReason

Bug: 904009
Change-Id: I13506b3b002a83a78d38a79006a02afa13a1c29f
Reviewed-on: https://chromium-review.googlesource.com/c/1354564Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Doug Arnett <dougarnett@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612226}