src/vs/workbench/services/extensions/electron-browser/cachedExtensionScanner.ts/ExtraBuiltInExtensionResolver/resolveExtensions
class ExtraBuiltInExtensionResolver:	resolveExtensions(): Promise<IExtensionReference[]> {
		const result: IExtensionReference[] = [];

		for (const ext of this.builtInExtensions) {
			const controlState = this.control[ext.name] || 'marketplace';

			switch (controlState) {
				case 'disabled':
					break;
				case 'marketplace':
					result.push({ name: ext.name, path: path.join(getExtraDevSystemExtensionsRoot(), ext.name) });
					break;
				default:
					result.push({ name: ext.name, path: controlState });
					break;
			}
		}

		return Promise.resolve(result);
	}