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To help finding performance hotspots.

(This is mostly for tracing the vaCreateBuffer() call -- since it
allocates a BO, it needs to clear it and takes a bit of time; the
question is how much, compared to video decoding in vaEndPicture()).

Bug: b:162962069
Change-Id: Icde7df8f44c36065c04e5e55e2f9866e73197e84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353015
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Jao-ke Chin-Lee <jchinlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797665}