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When switching from pending to activated state, there is no need to do
more animations as the final state of animations for these states are
the same. Otherwise, janks on slow devices might create some unwanted
effects like double ripples.

BUG=670831
TEST=manual

Review-Url: https://codereview.chromium.org/2615613003
Cr-Commit-Position: refs/heads/master@{#443366}