src/vs/platform/extensionManagement/common/extensionManagementIpc.ts/ExtensionManagementChannelClient/install
class ExtensionManagementChannelClient:	install(vsix: URI, options?: ServerInstallVSIXOptions): Promise<ILocalExtension> {
		return Promise.resolve(this.channel.call<ILocalExtension>('install', [vsix, options])).then(local => transformIncomingExtension(local, null));
	}