wireframe broken in webgpu

[robtfm]

Bevy version

0.16 / main

[Optional] Relevant system information

chrome/webgpu

What you did

enabled wireframe

What went wrong

[...]bevy_render\src\render_resource\pipeline_cache.rs:1026 failed to process shader:
error: failed to build a valid final module: Global variable [0] 'push_constants' is invalid
  ┌─ render/wireframe.wgsl:7:1
  │7
  │ var<push_constant> push_constants: PushConstants;
  │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ naga::GlobalVariable [0]
  │  = Capability Capabilities(PUSH_CONSTANT) is not supported

[JMS55]

Push constants are not supported on WebGPU.

Push constant usage was added in #18587.

[JMS55]

Looks like this was considered as part of the PR: #18587 (comment).

The solution might just be gating the wireframe type behind a wasm feature flag, or do a runtime warning.