src/vs/workbench/api/browser/mainThreadWebviewViews.ts/MainThreadWebviewsViews/$setWebviewViewDescription
class MainThreadWebviewsViews:	public $setWebviewViewDescription(handle: extHostProtocol.WebviewHandle, value: string | undefined): void {
		const webviewView = this.getWebviewView(handle);
		webviewView.description = value;
	}