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The new NewTabPage.Modules.Visible lets us track the ratio of NTP loads
with modules visible.

Bug: 1135393
Change-Id: I15a9fd064b7e189420e2eac2e9cecc72587f8fc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454733
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815244}