[core][android] Introduce mbgl::style::LayerTypeInfoupstream/mikhail_LayerTypeInfo

The `LayerTypeInfo` contains static meta data about certain layer type.

Each layer module should have a single immutable `LayerTypeInfo` instance
for the represented layer type. Both `LayerImpl` and `LayerFactory` from the
module always refer to the same `LayerTypeInfo` instance, so address of this
instance can be used as a layer module Id during the process life time.

1 files changed, 2 insertions, 6 deletions

diff --git a/include/mbgl/style/layers/custom_layer.hpp b/include/mbgl/style/layers/custom_layer.hpp
index 0d13001b91..5021df6a60 100644
--- a/include/mbgl/style/layers/custom_layer.hpp
+++ b/include/mbgl/style/layers/custom_layer.hpp
@@ -90,13 +90,9 @@ public:
     CustomLayerFactory();
     // LayerFactory overrides.
     ~CustomLayerFactory() override;
-    bool supportsType(const std::string& type) const noexcept final;
-    std::unique_ptr<style::Layer> createLayer(const std::string& id, const conversion::Convertible& value) final;
-
-    static CustomLayerFactory* get() noexcept;
 
-private:
-    static CustomLayerFactory* instance;
+    const LayerTypeInfo* getTypeInfo() const noexcept final;
+    std::unique_ptr<style::Layer> createLayer(const std::string& id, const conversion::Convertible& value) final;
 };
 
 } // namespace style