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

net/http/http_auth_handler_digest.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_DIGEST_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_DIGEST_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 52 matching lines @@
     ~Factory() override;
 
     // This factory owns the passed in |nonce_generator|.
     void set_nonce_generator(const NonceGenerator* nonce_generator);
 
     // 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;
 
    private:
     scoped_ptr<const NonceGenerator> nonce_generator_;
   };
 
+  // HttpAuthHandler
   HttpAuth::AuthorizationResult HandleAnotherChallenge(
       const HttpAuthChallengeTokenizer& challenge) override;
   ~HttpAuthHandlerDigest() override;
 
  protected:
-  int Init(const HttpAuthChallengeTokenizer& challenge) override;
-
+  // HttpAuthHandler
+  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:
   FRIEND_TEST_ALL_PREFIXES(HttpAuthHandlerDigestTest, ParseChallenge);
   FRIEND_TEST_ALL_PREFIXES(HttpAuthHandlerDigestTest, AssembleCredentials);
   FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionTest, DigestPreAuthNonceCount);
 
@@ skipping 73 matching lines @@
   // UTF-8.
   std::string original_realm_;
 
   int nonce_count_;
   const NonceGenerator* nonce_generator_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_DIGEST_H_