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This makes layers with animated opacity get treated as though they
have non-1 opacity when determining whether they need a render surface,
since an animation can cause opacity to change from 1 to non-1 without
a commit happening in between.

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2169143002
Cr-Commit-Position: refs/heads/master@{#407142}