src/vs/workbench/services/extensions/common/extensionHostManager.ts/ExtensionHostManager/deltaExtensions
class ExtensionHostManager:	public async deltaExtensions(extensionsDelta: IExtensionDescriptionDelta): Promise<void> {
		const proxy = await this._proxy;
		if (!proxy) {
			return;
		}
		this._extensionHost.extensions.delta(extensionsDelta);
		return proxy.deltaExtensions(extensionsDelta);
	}