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Some delegates called from this method may try accessing |current_frame_| which
can cause deadlocks. Therefore perform these checks right after |current_frame_|
is set and lock is released.

Bug: 901744
Change-Id: I56605cca8bad81a498a177ff8230598abfdd03fd
Reviewed-on: https://chromium-review.googlesource.com/c/1321092Reviewed-by: CJ DiMeglio <lethalantidote@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605947}