[gpu] Use DawnSharedTextureHolder in D3DImageBacking

Use DawnSharedTextureHolder that caches wgpu::Texture and
SharedTextureMemory per device within D3dImageBacking. This will be
helpful as we want to cache textures for the lifetime of the backing
instead of the representation. Also, adjust dxgi shared handle
state to cache shared texture memory properly.

Also add tracking for begin/end accesses for D3DBacking::DawnRep
so that the SharedTextureMemory::Begin/EndAccess are called only once
when cached.

NOTE: The Begin/EndAccess tracking will be moved to
DawnSharedTextureHolder in follow-up(s)

Bug: 348598119
Change-Id: I4b43587c07a97917a32c50078319e7efc7896a7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5685692
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Saifuddin Hitawala <hitawala@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1327737}