Reland "Enable shared texture encode and gpu color format conversion by default"

This is a reland of commit 3f06df5c9c2294272b20955debfa244756942842

Since the revert, multiple changes have landed to address IHV-specific
issues:
https://crrev.com/c/6451477
https://crrev.com/c/6541526
https://crrev.com/c/6612079

Original change's description:
> Enable shared texture encode and gpu color format conversion by default
>
> Turn on MediaFoundationD3DVideoProcessing and
> MediaFoundationSharedImageEncode by default.  Currently only
> WebCodecs' VideoEncoder makes use of shared texture handling in the
> encoder.
>
> Bug: 40162806
> Change-Id: I58bb10fc6ac34355948918a47764440d6bf291fd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6275035
> Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
> Commit-Queue: Erik Anderson <Erik.Anderson@microsoft.com>
> Reviewed-by: Erik Anderson <Erik.Anderson@microsoft.com>
> Cr-Commit-Position: refs/heads/main@{#1429309}

Bug: 40162806
Change-Id: Ia73be788adbc2c19a5040e7abfd954341a5495fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6499889
Auto-Submit: Erik Anderson <Erik.Anderson@microsoft.com>
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1470227}