Extracts a texture handle for a specific layer.
No replacement
<note>In the future Cogl may support purely GLSL based layers; for those layers this function which will likely return cogl_invalid_handle if you try to get the texture handle from them. Considering this scenario, you should call get_type first in order check it is of type cogl_material_layer_type_texture before calling this function.</note>
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a VertexBufferIndices for the texture inside the layer |