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The test is attempting to catch the second frame of an animated GIF
(2 x 400ms frames) using setTimeout(400).  This is super-fragile.

Refactor to use advanceImageAnimation() intead.

BUG=chromium:734733,chromium:729075

Change-Id: I1528e602bed7f9599cb3bbf9a2821354a2e7aaef
Reviewed-on: https://chromium-review.googlesource.com/541037Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481075}