src/vs/platform/extensionManagement/common/extensionManagementIpc.ts/ExtensionManagementChannelClient/download
class ExtensionManagementChannelClient:	async download(extension: IGalleryExtension, operation: InstallOperation): Promise<URI> {
		const result = await this.channel.call<UriComponents>('download', [extension, operation]);
		return URI.revive(result);
	}