src/vs/workbench/services/extensions/common/extensionHostManager.ts/LazyStartExtensionHostManager/start
class LazyStartExtensionHostManager:	public async start(enabledExtensionIds: ExtensionIdentifier[]): Promise<void> {
		if (enabledExtensionIds.length > 0) {
			// there are actual extensions, so let's launch the extension host
			const actual = this._createActual(`contains ${enabledExtensionIds.length} extension(s): ${enabledExtensionIds.map(extId => extId.value)}.`);
			const result = actual.start(enabledExtensionIds);
			this._startCalled.open();
			return result;
		}
		// there are no actual extensions
		this._startCalled.open();
	}