set_layer_matrix
Description:
This function lets you set a matrix that can be used to e.g. translate and rotate a single layer of a material used to fill your geometry.
Note: 
      
        
    
    Use cogl_pipeline_set_layer_matrix instead
Parameters:
| this | A  | 
| layer_index | the index for the layer inside this | 
| matrix | the transformation matrix for the layer |