Debuggee identifier. Either tabId or extensionId must be specified

class Debuggee extends ChromeObject {
 Debuggee({int tabId, String extensionId, String targetId}) {
   if (tabId != null) this.tabId = tabId;
   if (extensionId != null) this.extensionId = extensionId;
   if (targetId != null) this.targetId = targetId;
 }
 Debuggee.fromProxy(JsObject jsProxy): super.fromProxy(jsProxy);

 /**
  * The id of the tab which you intend to debug.
  */
 int get tabId => jsProxy['tabId'];
 set tabId(int value) => jsProxy['tabId'] = value;

 /**
  * The id of the extension which you intend to debug. Attaching to an
  * extension background page is only possible when 'enable-silent-debugging'
  * flag is enabled on the target browser.
  */
 String get extensionId => jsProxy['extensionId'];
 set extensionId(String value) => jsProxy['extensionId'] = value;

 /**
  * The opaque id of the debug target.
  */
 String get targetId => jsProxy['targetId'];
 set targetId(String value) => jsProxy['targetId'] = value;
}