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Users in the experiment will be shown the extensions page
alongside the NTP upon startup once.

Design Doc: go/extensionscheckup

Bug: 1019296
Change-Id: Ia9fd02ece790643b320ee3f68d7544349967f6eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864828
Commit-Queue: Archana Simha <archanasimha@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719431}