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This CL makes sure the test video decoder client thread is running
before scheduling a cleanup task on shutdown. During normal operation
this should not be triggered, but it's a good idea to add an extra check
anyway.

TEST=./video_decode_accelerator_tests on nocturne

BUG=None

Change-Id: I0a3dde6fc6b9103d4a4d2f44e2e768b7e88d5d38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032445Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742048}