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This CL use NTP clicks to help order the tiles.

BUG=1096224

Change-Id: I9d3ec7c9f2d8526a7ef6cd5e5f106a48b31d767a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418902
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809170}