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Sometimes TrayItemView::SetVisible() can be called repeatedly.
An example is PowerTrayView() -- its SetVisible() can be called
periodically based on the power status. That causes animation
and AnimationProgressed(), but that is redundant.

Bug: 1082562
Test: manually
Change-Id: I45573360edda49572975966d1a84d4d067edbf13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223432Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774381}