[7.x] [Maps] update LayerWizard previewLayer to take layerDescriptor instead of ISource (#64461)#64523

Merged

nreese merged 1 commit intoelastic:7.xfrom nreese:backport/7.x/pr-64461

Apr 27, 2020

+727-910

Commits on Apr 27, 2020

[Maps] update LayerWizard previewLayer to take layerDescriptor instead of ISource (elastic#64461 )

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