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Originally we assume that VD::CreateSurface() will be called after
AVD::SetStream() is called, and the returned surface is used for the
current bitstream buffer. However, the description of AVD doesn't
guarantee this fact.

This CL changes to set the timestamp that is mapped from bitstream id
passed from SurfaceReady(). This timestamp is actually reliable value.

BUG=b:140842667
TEST=run video_decode_accelerator_tests on Kevin and Eve

Change-Id: I255870c6220a4bd771e1f23b54c309fe8ca42246
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810452Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699204}