> As described in the commit log, we follow up the error code definition of Android WebView, 
in http://developer.android.com/reference/android/webkit/WebViewClient.html
I will update the design doc then.
Will also update the comments of the API.

Actually this answers what i want to ask. My point is if we are referencing some existing standard definition, as here the definition in android.webkit.WebViewClient. We should just reference it for code.

As here ,
`public static final int ERROR_OK = WebViewClient.ERROR_OK;`
And make it clear in the document we are returning the error code the same as legacy webview.