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AcceleratedVideoEncoder implemented in VaapiVideoEncodeAccelerator
returns one-time Picture on GetPicture(). In other words,
different Picture instances returns every GetPicture(). This
behavior likely leads to a bug. In fact, vp9 metadata is not filled
because it attaches the metadata in the returned Picture and
refers to it later but the pictures are different.
This CL fixes the interface so that it will always returns the same
instance.

Bug: 1030199
Test: tast run webrtc.* on atlas
Test: video_encode_accelerator_tests on atlas
Change-Id: I5ec1cb17e032566ed082469331f89a380d86148f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371085
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801697}