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Previously FuchsiaVideoDecoder was always returning 1 from
FuchsiaVideoDecoder::GetMaxDecodeRequests() for encrypted streams. As
result the decoder had at most one decode request and so it wasn't
decoding quickly enough. As result the renderer was sometimes running
of output buffers. This change updates GetMaxDecodeRequests() to return
value that includes the number of input buffers in the decryptor which
allows to run decoder pipeline more efficiently.

Bug: b/172062874
Change-Id: I394513debc02b43ea1bad801adc21a5b9efa5d0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536450Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827109}