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|textures_per_picture| is an implementation detail of the binding
texture wrapper.  This CL moves it entirely there, rather than having
it passed in from D3D11VideoDecoder.

Change-Id: I1cf12bfd4bcc52defd3610e0a9e0f94cd41129ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876759Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709330}