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