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When a user scrolls near the bottom of the NTP (with a variable offset),
the Discover provider function for loading the next feed's page is
called.

Bug: 1085419
Change-Id: I26c493bc588905e0018902261eb3d050291a83ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2237717
Commit-Queue: Adam Trudeau-Arcaro <adamta@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795335}