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

net/http/http_auth_handler_digest.cc

Index: net/http/http_auth_handler_digest.cc
diff --git a/net/http/http_auth_handler_digest.cc b/net/http/http_auth_handler_digest.cc
index 8c8787f6500502a868c8514754cdd062c90e8cb3..b31fa5a7100581b2784550dcc36f9e0b81a354c3 100644
--- a/net/http/http_auth_handler_digest.cc
+++ b/net/http/http_auth_handler_digest.cc
@@ -106,7 +106,17 @@ HttpAuth::AuthorizationResult HttpAuthHandlerDigest::HandleAnotherChallenge(
       HttpAuth::AUTHORIZATION_RESULT_REJECT;
 }
 
-int HttpAuthHandlerDigest::Init(const HttpAuthChallengeTokenizer& challenge) {
+int HttpAuthHandlerDigest::InitializeFromChallengeInternal(
+    const HttpAuthChallengeTokenizer& challenge,
+    const HttpResponseInfo&,
+    const CompletionCallback&) {
+  return ParseChallenge(challenge) ? OK : ERR_INVALID_RESPONSE;
+}
+
+int HttpAuthHandlerDigest::InitializeFromCacheEntryInternal(
+    HttpAuthCache::Entry* cache_entry) {
+  HttpAuthChallengeTokenizer challenge(cache_entry->auth_challenge().begin(),
+                                       cache_entry->auth_challenge().end());
   return ParseChallenge(challenge) ? OK : ERR_INVALID_RESPONSE;
 }
 
@@ -372,15 +382,13 @@ HttpAuthHandlerDigest::Factory::CreateAuthHandlerForScheme(
 scoped_ptr<HttpAuthHandler>
 HttpAuthHandlerDigest::Factory::CreateAndInitPreemptiveAuthHandler(
     HttpAuthCache::Entry* cache_entry,
-    const HttpAuthChallengeTokenizer& tokenizer,
     HttpAuth::Target target,
     const BoundNetLog& net_log) {
   if (cache_entry->scheme() != kDigestSchemeName)
     return scoped_ptr<HttpAuthHandler>();
   scoped_ptr<HttpAuthHandler> handler(new HttpAuthHandlerDigest(
       cache_entry->IncrementNonceCount(), nonce_generator_.get()));
-  int rv = handler->HandleInitialChallenge(tokenizer, target,
-                                           cache_entry->origin(), net_log);
+  int rv = handler->InitializeFromCacheEntry(cache_entry, target, net_log);
   if (rv == OK)
     return handler;
   return scoped_ptr<HttpAuthHandler>();