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This patch adds the support of the optional feature "bgra8unorm-storage" on D3D12 when the platform allows using DXGI_FORMAT_B8G8R8A8_UNORM as UAVs. According to D3D12 documents, enabling the flag D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS when creating textures requires "either the texture format must support unordered access capabilities at the current feature level. Or, when the format is a typeless format, a format within the same typeless group must support unordered access capabilities at the current feature level". Bug: dawn:1641 Test: dawn_end2end_tests Change-Id: If16271b5da52423e73ad4f7ba258af83dbf66dd2 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/119345 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: Jiawei Shao <jiawei.shao@intel.com> Kokoro: Kokoro <noreply+kokoro@google.com>