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Encoding for Vaapi has 4 parts: (1) copying the video frame contents,
(2) submitting some buffers, (3) executing the encode, and finally
(4) downloading the encoded chunk.

During crrev.com/c/2344526 I was taking a look at the chrome traces
for it and reckoned it'd be good to split out some of them, namely this
CL adds more targeted metrics for:
- In part 1, for the libyuv copy-conversion that takes the majority of
the time.
- In part 4, for the SyncSurface (largest part), with a smaller share
taken by copying the encoded chunk out.

No new functionality intended.

Bug: b/166646505
Change-Id: Id0f6dbcb4c119e2692c2fa7ab999100e1cac77b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427069Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810574}