[Desktop] Add diagnostics about loading the refresh tokens.

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

 // 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.
 
 #ifndef COMPONENTS_SIGNIN_CORE_BROWSER_WEBDATA_TOKEN_SERVICE_TABLE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_WEBDATA_TOKEN_SERVICE_TABLE_H_
 
 #include <map>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/webdata/common/web_database_table.h"
 
 class WebDatabase;
 
 class TokenServiceTable : public WebDatabaseTable {
  public:
+  enum Result {
+    TOKEN_DB_RESULT_SQL_INVALID_STATEMENT,
+    TOKEN_DB_RESULT_BAD_ENTRY,
+    TOKEN_DB_RESULT_DECRYPT_ERROR,
+    TOKEN_DB_RESULT_SUCCESS
+  };
+
   TokenServiceTable() {}
   ~TokenServiceTable() override {}
 
   // Retrieves the TokenServiceTable* owned by |database|.
   static TokenServiceTable* FromWebDatabase(WebDatabase* db);
 
   WebDatabaseTable::TypeKey GetTypeKey() const override;
   bool CreateTablesIfNecessary() override;
   bool IsSyncable() override;
   bool MigrateToVersion(int version, bool* update_compatible_version) override;
 
   // Remove all tokens previously set with SetTokenForService.
   bool RemoveAllTokens();
 
   // Removes a token related to the service from the token_service table.
   bool RemoveTokenForService(const std::string& service);
 
   // Retrieves all tokens previously set with SetTokenForService.
   // Returns true if there were tokens and we decrypted them,
   // false if there was a failure somehow
-  bool GetAllTokens(std::map<std::string, std::string>* tokens);
+  Result GetAllTokens(std::map<std::string, std::string>* tokens);
 
   // Store a token in the token_service table. Stored encrypted. May cause
   // a mac keychain popup.
   // True if we encrypted a token and stored it, false otherwise.
   bool SetTokenForService(const std::string& service,
                           const std::string& token);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TokenServiceTable);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_WEBDATA_TOKEN_SERVICE_TABLE_H_