[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 79 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"));
 
   UMA_HISTOGRAM_BOOLEAN("Signin.TokenTable.GetAllTokensSqlStatementValidity",
                         s.is_valid());
 
   if (!s.is_valid()) {
     LOG(ERROR) << "Failed to load tokens (invalid SQL statement).";
-    return false;
+    return TOKEN_DB_RESULT_SQL_INVALID_STATEMENT;
   }
 
-  bool read_all_tokens_result = true;
+  Result read_all_tokens_result = TOKEN_DB_RESULT_SUCCESS;
   while (s.Step()) {
     ReadOneTokenResult read_token_result = READ_ONE_TOKEN_MAX_VALUE;
 
     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;
         read_token_result = READ_ONE_TOKEN_SUCCESS;
       } 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;
         read_token_result = READ_ONE_TOKEN_DB_SUCCESS_DECRYPT_FAILED;
-        read_all_tokens_result = false;
+        read_all_tokens_result = TOKEN_DB_RESULT_DECRYPT_ERROR;
       }
     } else {
       LOG(ERROR) << "Bad token entry for service " << service;
       read_token_result = READ_ONE_TOKEN_DB_FAILED_BAD_ENTRY;
-      read_all_tokens_result = false;
+      read_all_tokens_result = TOKEN_DB_RESULT_BAD_ENTRY;
     }
     DCHECK_LT(read_token_result, READ_ONE_TOKEN_MAX_VALUE);
     UMA_HISTOGRAM_ENUMERATION("Signin.TokenTable.ReadTokenFromDBResult",
                               read_token_result,
                               READ_ONE_TOKEN_MAX_VALUE);
   }
   return read_all_tokens_result;
 }