John Firebaugh c4e4cc5081 [core] Adjust layer source properties to better reflect reality ...

* Layer source ID is immutable; must be provided to the constructor
* Layer source layer is mutable
* Layers with GeoJSON sources do not have a source layer

While here, make Layer::copy impl-private.

2016-06-24 09:39:15 -07:00

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mbgl

[core] Adjust layer source properties to better reflect reality

2016-06-24 09:39:15 -07:00