src/vs/workbench/services/extensions/common/extensionHostManager.ts/ExtensionHostManager/deltaExtensions
class ExtensionHostManager:	public async deltaExtensions(toAdd: IExtensionDescription[], toRemove: ExtensionIdentifier[]): Promise<void> {
		const proxy = await this._proxy;
		if (!proxy) {
			return;
		}
		this._extensionHost.extensions.deltaExtensions(toAdd, toRemove);
		return proxy.deltaExtensions(toAdd, toRemove);
	}