Add Glimmer focusColor Button's parameter

[tiwiz]

No description provided.

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• xr/src/main/java/com/example/xr/glimmer/ButtonSamples.kt:82, tag androidxr_glimmer_button_focus_color

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[devbridie]

A definition of snapshotVersion should not make it to main; please change to a WIP PR if it's WIP or rebase onto jxr-next instead, which is on 16424130

[devbridie]

SNAPSHOT usage