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Before this CL, the fade-in transition would trigger inconsistently, maybe in 1 out of 10 cases. Now it triggers consistently, only when the tiles change, but not when the first set of tiles is shown.

BUG=645158
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2316423003
Cr-Commit-Position: refs/heads/master@{#417539}