Reland "Dawn: Add DawnImageRepresentationFallback."

This is a reland of commit 5ff653233b7614c960f56c0216a987dec21c4079

What's changed:
- Fixed the linking error when chrome is not built with dawn.

Original change's description:
> Dawn: Add DawnImageRepresentationFallback.
>
> To support sharing IOSurface backed SI with Dawn's Vulkan/SwiftShader
> backend. Currently this DawnImageRepresentationFallback
> is implemented by CPU readbacks/uploads.
>
> In theory this class could be used by any backing not natively supported
> by Vulkan/SwiftSahder in future. Such as D3DImageBacking. As long as
> those backings implement UploadFromMemory & ReadbackToMemory methods.
>
> Bug: dawn:1953
> Change-Id: Ie87dddecac89103654015cb3063d2deac6de2299
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4759704
> Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
> Commit-Queue: Quyen Le <lehoangquyen@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1184331}

Bug: dawn:1953
Change-Id: I4c619e52674edda470a145c649737115607e3d22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4790883
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Quyen Le <lehoangquyen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1185220}