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This refactor sees D3D11PictureBuffer no longer holding a D3D11Texture2D,
instead it holds a wrapper class which is responsible for creating and
owning gpu resources and mailboxes.

The default wrapper behaves exactly like the old implementation.

Bug: 963742
Change-Id: I49c67517203ef6464a6f0f2d3609bd7e484ac4a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614937
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664459}