[Desktop] Add diagnostics about loading the refresh tokens.

components/signin/core/browser/webdata/token_service_table.cc

 // Copyright 2014 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 "components/signin/core/browser/webdata/token_service_table.h"
 
 #include <map>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 71 matching lines @@
   sql::Statement s(db_->GetUniqueStatement(
       "INSERT OR REPLACE INTO token_service "
       "(service, encrypted_token) VALUES (?, ?)"));
   s.BindString(0, service);
   s.BindBlob(1, encrypted_token.data(),
              static_cast<int>(encrypted_token.length()));
 
   return s.Run();
 }
 
-bool TokenServiceTable::GetAllTokens(
+TokenServiceTable::Result TokenServiceTable::GetAllTokens(
     std::map<std::string, std::string>* tokens) {
   sql::Statement s(db_->GetUniqueStatement(
       "SELECT service, encrypted_token FROM token_service"));
 
   if (!s.is_valid()) {
     LOG(ERROR) << "Failed to load tokens (invalid SQL statement).";
     base::RecordAction(
         base::UserMetricsAction("Signin_TokenTable_GetAllTokensInvalidSql"));
-    return false;
+    return TOKEN_DB_RESULT_SQL_INVALID_STATEMENT;
   }
 
+  Result result = TOKEN_DB_RESULT_SUCCESS;
   while (s.Step()) {
     std::string encrypted_token;
     std::string decrypted_token;
     std::string service;
     service = s.ColumnString(0);
     bool entry_ok = !service.empty() &&
                     s.ColumnBlobAsString(1, &encrypted_token);
     if (entry_ok) {
       if (OSCrypt::DecryptString(encrypted_token, &decrypted_token)) {
         (*tokens)[service] = decrypted_token;
         base::RecordAction(
             base::UserMetricsAction("Signin_TokenTable_LoadTokenSuccess"));
       } else {
         // Chrome relies on native APIs to encrypt and decrypt the tokens which
         // may fail (see http://crbug.com/686485).
         LOG(ERROR) << "Failed to decrypt token for service " << service;
         base::RecordAction(
             base::UserMetricsAction("Signin_TokenTable_DecryptFailed"));
+        result = TOKEN_DB_RESULT_DECRYPT_ERROR;
       }
     } else {
       LOG(ERROR) << "Bad token entry for service " << service;
       base::RecordAction(base::UserMetricsAction("Signin_TokenTable_BadEntry"));
-      return false;
+      result = TOKEN_DB_RESULT_BAD_ENTRY;
     }
   }
-  return true;
+  return result;
 }