The default gltf for android's gltf-viewer is the buster drone,
which uses skinning.
We add an additional model (damaged helmet) as an alternative
default. This will be useful for debugging WebGPU, where skinnning is
not yet supported. This alternate path can only be invoke by starting
the app through adb:
`adb shell am start -n com.google.android.filament.gltf/.MainActivity --ez "use-static-model" true`
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