webRequest.onAuthRequired listeners can provide authentication credentials.

net/base/auth.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_BASE_AUTH_H__
 #define NET_BASE_AUTH_H__
 #pragma once
 
 #include <string>
 
@@ skipping 47 matching lines @@
   string16 password;  // the password supplied to us for auth.
 
   // We wouldn't instantiate this class if we didn't need authentication.
   AuthData();
 
  private:
   friend class base::RefCountedThreadSafe<AuthData>;
   ~AuthData();
 };
 
+// Authentication Credentials for an authentication credentials.
+class NET_EXPORT AuthCredentials {
+ public:
+  AuthCredentials();
+  ~AuthCredentials();
+
+  // |is_valid| is true if the username and password have been set. Since
+  // username and/or password may be empty, this is needed to differentiate
+  // that case.
+  bool is_valid;
+
+  // The username to provide, possibly empty. This should be ASCII only to
+  // minimize compatibility problems, but arbitrary UTF-16 strings are allowed
+  // and will be attempted.
+  string16 username;
+
+  // The password to provide, possibly empty. This should be ASCII only to
+  // minimize compatibility problems, but arbitrary UTF-16 strings are allowed
+  // and will be attempted.
+  string16 password;
+
+  // Intentionally allowing the implicit copy constructor and assignment
+  // operators.
+};
+
 }  // namespace net
 
 #endif  // NET_BASE_AUTH_H__