addTreeRuntimeRequirements(chunk, items) {
		const cgc = this._getChunkGraphChunk(chunk);
		const runtimeRequirements = cgc.runtimeRequirementsInTree;
		for (const item of items) runtimeRequirements.add(item);
	}
@param {Chunk} chunk the chunk
@param {Iterable<string>} items runtime requirements to be added
@returns {void}