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This CL will allow the server to send more trending tiles to the client, and
client can cache those tiles to replace existing trending tiles if they are
not being interacted after some time.
By default, 2 trending tiles will be shown. If a trending tile is shown twice,
it will be removed if no activity is recorded.

Bug: 1154456
Change-Id: I7bf304b56b86e92ad51446bf82427e24dbd810d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568224Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833419}