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The VP9 show_existing_frame feature allows a decoded frame be
outputted multiple times. This CL supports this feature at V4L2SVD
implementation. Before sending VideoFrame to the client, we set the
correct timestamp corresponding to the bitstream ID. This makes it
possible for the same video frame memory to be output several times
with different timestamps.

BUG=941330
TEST=Play video with show_existing_frame at File app.

Change-Id: I2f78f59ff40e49c0c724cf43a54bcb233097cbcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631230
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Auto-Submit: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676375}