srcUrl in OnClickData based on description from http://dev.opera.com/extensions/contextMenus.html

(link from chrome doc doesn't work https://developer.chrome.com/extensions/contextMenusInternal#type-OnClickData)

chrome/chrome.d.ts

@@ -294,6 +294,7 @@ declare module chrome.contextMenus {
         pageUrl: string;
         linkUrl?: string;
         parentMenuItemId?: any;
+        srcUrl?: string;
     }
 
     interface CreateProperties {