signin: record http response codes and net errors in OAuth2AccessTokenFetcher.

chrome/browser/sync/profile_sync_service.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/sync/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 652 matching lines @@
     case GoogleServiceAuthError::SERVICE_UNAVAILABLE: {
       // Transient error. Retry after some time.
       request_access_token_backoff_.InformOfRequest(false);
       request_access_token_retry_timer_.Start(
             FROM_HERE,
             request_access_token_backoff_.GetTimeUntilRelease(),
             base::Bind(&ProfileSyncService::RequestAccessToken,
                         weak_factory_.GetWeakPtr()));
       break;
     }
+    case GoogleServiceAuthError::SERVICE_ERROR:
     case GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS: {
       // Report time since token was issued for invalid credentials error.
       base::Time auth_token_time =
           AboutSigninInternalsFactory::GetForProfile(profile_)->
               GetTokenTime(GaiaConstants::kGaiaOAuth2LoginRefreshToken);
       if (!auth_token_time.is_null()) {
         base::TimeDelta age = base::Time::Now() - auth_token_time;
         if (age < base::TimeDelta::FromHours(1)) {
           UMA_HISTOGRAM_CUSTOM_TIMES("Sync.AuthServerRejectedTokenAgeShort",
                                      age,
@@ skipping 1451 matching lines @@
     NOTREACHED();
 #endif
   }
 
   return signin_->GetAuthenticatedUsername();
 }
 
 WeakHandle<syncer::JsEventHandler> ProfileSyncService::GetJsEventHandler() {
   return MakeWeakHandle(sync_js_controller_.AsWeakPtr());
 }