Push constants in render bundles are half-implemented

[jimblandy]

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RenderBundleEncoder::finish propagates SetPushConstant commands from the encoder to the final RenderBundle, but the bundle's BasePass's push_constant_data vector is always empty.

[jimblandy]

Note that push constants are not yet specified in WebGPU: gpuweb/gpuweb#75

[simonask]

Coming up on the 2-year anniversary for this issue, are there any current plans to support this? If nothing else, it would probably be good to catch any use of push constants in RenderBundleEncoder, rather than crashing at (potentially much later) point in time. Potentially by removing the set_push_constants method altogether until this is actually implemented. :-)

[cwfitzgerald]

I don't think this is on anybody's radar right now, so we'd accept a PR either fixing it, or removing it.