addChunkRuntimeRequirements(chunk, items) {
		const cgc = this._getChunkGraphChunk(chunk);
		const runtimeRequirements = cgc.runtimeRequirements;
		if (runtimeRequirements === undefined) {
			cgc.runtimeRequirements = items;
		} else if (runtimeRequirements.size >= items.size) {
			for (const item of items) runtimeRequirements.add(item);
		} else {
			for (const item of runtimeRequirements) items.add(item);
			cgc.runtimeRequirements = items;
		}
	}
@param {Chunk} chunk the chunk
@param {Set<string>} items runtime requirements to be added (ownership of this Set is given to ChunkGraph)
@returns {void}