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media::VideoDecoder implementation may be destroyed on different
thread from the thread that the client releases it. We should make
sure the destruction is done before test environment is released.

This CL call RunUntilIdle() before releasing the test environment.

BUG=none
TEST=run video_decode_accelerator_perf_tests on Eve

Change-Id: Ifeec98da8c2f7a9798d45f973bcf2e4901bdb411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772874
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691540}