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Adds repaint stories for 10 top desktop sites.  Stories use snapshots
made with 'snap-it', to reduce potential noise from page script.

Local run-time on Linux: 4m9s

BUG=906757

Change-Id: Ic08be0509f7cf66008ede33e2e26525856c58c9d
Reviewed-on: https://chromium-review.googlesource.com/c/1343079
Commit-Queue: Victor Miura <vmiura@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609927}