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The timer was added for the fear that the wallpaper animation
completion is never received. In fact, it's guaranteed to be received.

In case there's a decoder issue (more info in the bug) that wallpaper
decoding takes more than 5 sec:

1) If keeping the timer, the user pods will be shown on top of the
   white boot splash screen, which looks buggy.
2) If removing the timer, the user pods will show together with the
   wallpaper. The boot experience feels slow but still smooth.

So IMO the best solution is to remove the timer as well as trying to
fix the decoder issue.

Bug: 890935
Change-Id: I685a0065acae99ebccd2734dcebd9dce2f563dbb
Reviewed-on: https://chromium-review.googlesource.com/1255903Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596284}