[Android WebView] Implement OnReceivedHttpError 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 cb8bc26d197e241d13a4cce8f0d95e5bd11608cb..15fddc8b8dcb6a0d566280af0e4ab4adb2ff34de 100644
--- a/android_webview/browser/aw_contents_io_thread_client.h
+++ b/android_webview/browser/aw_contents_io_thread_client.h
@@ -12,6 +12,7 @@
 class GURL;
 
 namespace net {
+class HttpResponseHeaders;
 class URLRequest;
 }
 
@@ -102,6 +103,11 @@ class AwContentsIoThreadClient {
   virtual void NewLoginRequest(const std::string& realm,
                                const std::string& account,
                                const std::string& args) = 0;
+
+  // Called when a response from the server is received with status code >= 400.
+  virtual void OnReceivedHttpError(
+      const net::URLRequest* request,
+      const net::HttpResponseHeaders* response_headers) = 0;
 };
 
 } // namespace android_webview