add error logs in browser web view

src/web/browser/WBWebView.h

@@ -95,6 +95,33 @@ class WBWebPage : public UBWebPage
         QWebPage *createWindow(QWebPage::WebWindowType type);
         QObject *createPlugin(const QString &classId, const QUrl &url, const QStringList &paramNames, const QStringList &paramValues);
 
+        bool supportsExtension(Extension extension) const {
+            if (extension == QWebPage::ErrorPageExtension)
+            {
+                return true;
+            }
+            return false;
+        }
+
+        bool extension(Extension extension, const ExtensionOption *option = 0, ExtensionReturn *output = 0)
+        {
+            if (extension != QWebPage::ErrorPageExtension)
+                return false;
+
+            ErrorPageExtensionOption *errorOption = (ErrorPageExtensionOption*) option;
+            qDebug() << "Error loading " << qPrintable(errorOption->url.toString());
+            if(errorOption->domain == QWebPage::QtNetwork)
+                qDebug() << "Network error (" << errorOption->error << "): ";
+            else if(errorOption->domain == QWebPage::Http)
+                qDebug() << "HTTP error (" << errorOption->error << "): ";
+            else if(errorOption->domain == QWebPage::WebKit)
+                qDebug() << "WebKit error (" << errorOption->error << "): ";
+
+            qDebug() << qPrintable(errorOption->errorString);
+
+            return false;
+        }
+
     private slots:
         void handleUnsupportedContent(QNetworkReply *reply);