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This CL hooks the video thumbnail backend to the UI layer of new
download home.

Bug: 826021
Change-Id: I190ad09e8231d94d7546128bd1d22dc39f4d5f35
Reviewed-on: https://chromium-review.googlesource.com/1247529
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595706}