Enable remote debugging in Cordova Production webview.

SystemWebViewEngine.java

//In {project}/platforms/android/CordovaLib/src/org/apache/cordova/engine/SystemWebViewEngine.java

    //Determine whether we're in debug or release mode, and turn on Debugging!
    ApplicationInfo appInfo = webView.getContext().getApplicationContext().getApplicationInfo();
    if ((appInfo.flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0 &&
        android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
        enableRemoteDebugging();
    }

//  ....

    @TargetApi(Build.VERSION_CODES.KITKAT)
    private void enableRemoteDebugging() {
        try {
            WebView.setWebContentsDebuggingEnabled(true);
        } catch (IllegalArgumentException e) {
            LOG.d(TAG, "You have one job! To turn on Remote Web Debugging! YOU HAVE FAILED! ");
            e.printStackTrace();
        }
    }