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This patch adds support for 8-bit and fp16 RGB textures via KHR
streams, since ANGLE almost supports it.  8-bit textures work
as-is, but fp16 requires a small patch to ANGLE.

However, since fp16 support is off by default in D3D11VideoDecoder
anyway, it's okay to land this without ordering with respect to the
ANGLE changes.

Change-Id: I484760e462341bc6cad699d35f2c9733a7404c5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079451Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745267}