Image bindings are placed after atomic counters in the "resources"
descriptor set.

There are two issues yet to be addressed:

- GL can create a 2D (array) view of a 3D image, but this is not allowed
  in Vulkan.  If this cannot be made possible, emulation needs to be
  done.

  https://github.com/KhronosGroup/Vulkan-Docs/issues/1033

- GL can create an image view of a texture with a different format and
  have the data reinterpreted.  This is not currently done.

Bug: angleproject:3563
Change-Id: I95c4d92c50bb033212a9a67f3f2d6f97c074c7bf
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1767366
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>