[net/http auth] Make HttpAuthHandler challenge handling asynchronous.

net/http/http_auth_handler_basic.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_HTTP_HTTP_AUTH_HANDLER_BASIC_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_BASIC_H_
 
 #include <string>
 
 #include "net/base/net_export.h"
 #include "net/http/http_auth_handler.h"
 #include "net/http/http_auth_handler_factory.h"
 
 namespace net {
 
 // Code for handling http basic authentication.
 class NET_EXPORT_PRIVATE HttpAuthHandlerBasic : public HttpAuthHandler {
  public:
   class NET_EXPORT_PRIVATE Factory : public HttpAuthHandlerFactory {
    public:
     Factory();
     ~Factory() override;
 
     // HttpAuthHandlerFactory
     scoped_ptr<HttpAuthHandler> CreateAuthHandlerForScheme(
         const std::string& scheme) override;
     scoped_ptr<HttpAuthHandler> CreateAndInitPreemptiveAuthHandler(
         HttpAuthCache::Entry* cache_entry,
-        const HttpAuthChallengeTokenizer& tokenizer,
         HttpAuth::Target target,
         const BoundNetLog& net_log) override;
   };
 
   ~HttpAuthHandlerBasic() override {}
 
   // HttpAuthHandler
   HttpAuth::AuthorizationResult HandleAnotherChallenge(
       const HttpAuthChallengeTokenizer& challenge) override;
 
  protected:
   // HttpAuthHandler
-  int Init(const HttpAuthChallengeTokenizer& challenge) override;
+  int InitializeFromChallengeInternal(
+      const HttpAuthChallengeTokenizer& challenge,
+      const HttpResponseInfo& response_with_challenge,
+      const CompletionCallback& callback) override;
+  int InitializeFromCacheEntryInternal(
+      HttpAuthCache::Entry* cache_entry) override;
   int GenerateAuthTokenImpl(const AuthCredentials* credentials,
                             const HttpRequestInfo& request,
                             const CompletionCallback& callback,
                             std::string* auth_token) override;
 
  private:
   HttpAuthHandlerBasic();
   int ParseChallenge(const HttpAuthChallengeTokenizer& challenge);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_BASIC_H_