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This CL creates a SharedImageRepresentationDawn for Ozone-based
SharedImages. This is mostly adapted from
ExternalVkImageDawnRepresentation and works by passing the dma-buf
handle to Dawn.

Synchronization will be added in a following CL.

Bug: 1023997,996470
Change-Id: I940a0ec9d659d31efaa63fac909d312d3558e675
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913083
Commit-Queue: Brian Ho <hob@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722672}