Reland "[Graphite][metal] Pass Dawn Metal device for HDRCopierLayer"

This is a reland of commit 43a789f7c93a391d999262ac2280cc006aeca3ef

Difference from original:
I believe earlier tests were running Dawn Swiftshader-Vulkan backend
and so the MTLDevice was not there and it was crashing elsewhere. This
checks for dawn_context_provider (which is created only for graphite)
and the dawn BackendType for BackendType::Metal and only then proceeds
to get the MTLDevice and passes it along. Tested with the
mac13.arm64-skia-alt-blink-rel on CQ.

Original change's description:
> [Graphite][metal] Pass Dawn Metal device for HDRCopierLayer
>
> Pass Dawn Metal device which will be used to create the CAMetalLayer
> that is used to display HDR IOSurfaces by HDRCopierLayer. This is
> needed with SkiaGraphite instead of ANGLE device which was used
> earlier with Ganesh.
>
> Bug: 40260111
> Change-Id: I3479e83d159488622e8551a4032a98f54ede1cca
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5639818
> Commit-Queue: Saifuddin Hitawala <hitawala@chromium.org>
> Reviewed-by: Colin Blundell <blundell@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1317046}

Bug: 40260111
Change-Id: I647e8faaf81468a0a00355213f4fc1f75cce6f3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5648416
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Saifuddin Hitawala <hitawala@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1318214}