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In PIX's D3D12-only mode, there is no way to determine frame
boundaries for WebGPU since Dawn does not manage DXGI swap chains.
Without assistance, PIX will wait forever for a present that never
happens.

If we know we're dealing with a swapbuffer texture, inform Dawn,
which informs PIX we've "presented" the texture so it can determine
frame boundaries and use the texture's contents for the UI.

Bug: dawn:364
Change-Id: I6b157a04df02be697dad6b5bc9d76c33969f9fda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124875Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#755015}