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

chrome/browser/extensions/api/identity/identity_api.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/extensions/api/identity/identity_api.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 265 matching lines @@
   CompleteMintTokenFlow();
   CompleteFunctionWithResult(access_token);
 }
 
 void IdentityGetAuthTokenFunction::OnMintTokenFailure(
     const GoogleServiceAuthError& error) {
   CompleteMintTokenFlow();
 
   switch (error.state()) {
     case GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS:
+    case GoogleServiceAuthError::SERVICE_ERROR:
     case GoogleServiceAuthError::ACCOUNT_DELETED:
     case GoogleServiceAuthError::ACCOUNT_DISABLED:
       extensions::IdentityAPI::GetFactoryInstance()
           ->GetForProfile(GetProfile())
           ->ReportAuthError(error);
       if (should_prompt_for_signin_) {
         // Display a login prompt and try again (once).
         StartSigninFlow();
         return;
       }
@@ skipping 481 matching lines @@
     const IdentityAPI::TokenCacheKey& rhs) const {
   if (extension_id < rhs.extension_id)
     return true;
   else if (rhs.extension_id < extension_id)
     return false;
 
   return scopes < rhs.scopes;
 }
 
 }  // namespace extensions