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If the first tile is not frequently clicked, other tiles may be displayed
before it. And those tiles, even if they are not clicked for many days,
will stay before the first.
This may cause new front tiles, such as the trending tiles, to have a
lower score than those not clicked tiles. And will not show up in the
front. This CL fixes that issue

BUG=1136306

Change-Id: I2f5aa7d3a64450b23375b2df2647265ed9c70c22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459941
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@{#815277}