[google_maps_flutter] The FloatingActionButton requires an icon

[sam-toon]

The sample code doesn't work. It needs an icon specified for the FloatingActionButton.

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[sam-toon]

I signed it!

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[amirh]

LGTM

Thanks!
I was working off master where icon is not required anymore (flutter/flutter#27711). But yeah we should make sure this works with stable.