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This CL makes the video_decode_accelerator_(perf_)tests print an error message
when waiting for a specific event times out.

Currently a generic error will be printed when a timeout occurs:
  video_decode_accelerator_tests.cc:179: Failure
  Value of: tvp->WaitForFlushDone()
    Actual: false
  Expected: true

This CL makes it easier to see that a timeout happened:
  Timeout while waiting for 'FlushDone' event

TEST=./video_decode_accelerator_tests on nocturne

BUG=1020668

Change-Id: I58d609056ece2685c882a96691061a164dda2996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898895Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713246}