[Android WebView] Implement a better OnReceivedError callback

android_webview/browser/aw_contents_io_thread_client.h

Index: android_webview/browser/aw_contents_io_thread_client.h
diff --git a/android_webview/browser/aw_contents_io_thread_client.h b/android_webview/browser/aw_contents_io_thread_client.h
index 15fddc8b8dcb6a0d566280af0e4ab4adb2ff34de..257adaab751d6ebb24776af3482b5ca1075b9605 100644
--- a/android_webview/browser/aw_contents_io_thread_client.h
+++ b/android_webview/browser/aw_contents_io_thread_client.h
@@ -104,6 +104,10 @@ class AwContentsIoThreadClient {
                                const std::string& account,
                                const std::string& args) = 0;
 
+  // Called when a resource loading error has occured (e.g. an I/O error,
+  // host name lookup failure etc.)
+  virtual void OnReceivedError(const net::URLRequest* request) = 0;
+
   // Called when a response from the server is received with status code >= 400.
   virtual void OnReceivedHttpError(
       const net::URLRequest* request,