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This adds the formats to dawn.json, implements support in the Vulkan backend and adds tests performing basic sampling checks for all formats. The R8UnormSrgb and RG8UnormSrgb formats skipped because they are not required in Vulkan (and RG8UnormSrgb is in fact not supported on the machine used for developing this CL). A PR will be sent to the WebGPU repo to remove the from the initial list of formats. The RG11B10Float and RGB10A2Unorm formats of WebGPU are replaced with B10GR11Float and A2RGB10Unorm that are the formats exposed by Vulkan. It is likely that all APIs implement them with components stored in that order. Each format except depth-stencil ones is tested by uploading some interesting texel data and checking that sampling from the texture produces correct results. The goal is to make sure that backends don't make a mistake in the giant switch statements. There was no effort made to check the hardware implementation of the formats. Tests will later be extended to cover rendering and clearing operations as well as multisample resolve. It isn't clear if depth-stencil format will support TRANSFER operations in WebGPU so these are left untested for now. BUG=dawn:128 Change-Id: I78ac5bf77b57398155551e6db3de50b478d69452 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8363 Reviewed-by: Austin Eng <enga@chromium.org> Reviewed-by: Jiawei Shao <jiawei.shao@intel.com> Commit-Queue: Corentin Wallez <cwallez@chromium.org>