function _loadTexture( fontVariant, textureUrl ) {

	fontVariant._texture = new external_three_namespaceObject.TextureLoader().load( textureUrl, ( texture ) => {

		fontVariant._buildTexture( texture );
		fontVariant._checkReadiness();

	} );

}
Load a msdf texture then build texture

@param {FontVariant} fontVariant
@param {string} textureUrl
@private