webRequest.onAuthRequired listeners can provide authentication credentials.

net/url_request/url_request.h

Index: net/url_request/url_request.h
diff --git a/net/url_request/url_request.h b/net/url_request/url_request.h
index 640f045e60f73970f74a5c73fb44237be1c08bb3..eb1df109dfff2e763b9478a615d8af8230b1741c 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -17,6 +17,7 @@
 #include "base/string16.h"
 #include "base/threading/non_thread_safe.h"
 #include "googleurl/src/gurl.h"
+#include "net/base/auth.h"
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
@@ -712,6 +713,7 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   // |delegate_| is not NULL. See URLRequest::Delegate for the meaning
   // of these functions.
   void NotifyAuthRequired(AuthChallengeInfo* auth_info);
+  void NotifyAuthRequiredComplete(int result);
   void NotifyCertificateRequested(SSLCertRequestInfo* cert_request_info);
   void NotifySSLCertificateError(int cert_error, X509Certificate* cert);
   bool CanGetCookies(const CookieList& cookie_list) const;
@@ -803,6 +805,11 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   // TODO(battre): Remove this. http://crbug.com/89049
   bool has_notified_completion_;
 
+  // Go out to the extension to see things.
+  AuthCredentials auth_credentials_;
+  CompletionCallbackImpl<URLRequest> auth_required_callback_;
+  scoped_refptr<AuthChallengeInfo> auth_info_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };