Bug 261890

fragmentWriteGBuffers.wgsl from https://webgpu.github.io/webgpu-samples/samples/deferredRendering#fragmentWriteGBuffers.wgsl does not compile because it writes to multiple render targets and the locations are not specified.

I.e., in the generated output:

struct type0 {
    vec<float, 4> normal ;
    vec<float, 4> albedo ;
};

should be:

struct type0 {
    vec<float, 4> normal [[color(0)]];
    vec<float, 4> albedo [[color(1)]];
};