[Sync] Move //sync to //components/sync.

sync/syncable/syncable_base_transaction.h

-// Copyright 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.
-
-#ifndef SYNC_SYNCABLE_SYNCABLE_BASE_TRANSACTION_H_
-#define SYNC_SYNCABLE_SYNCABLE_BASE_TRANSACTION_H_
-
-#include <string>
-
-#include "base/location.h"
-#include "base/macros.h"
-#include "sync/base/sync_export.h"
-#include "sync/syncable/syncable_id.h"
-
-namespace syncer {
-namespace syncable {
-
-class Directory;
-
-// A WriteTransaction has a writer tag describing which body of code is doing
-// the write. This is defined up here since WriteTransactionInfo also contains
-// one.
-enum WriterTag {
-  INVALID,
-  SYNCER,
-  AUTHWATCHER,
-  UNITTEST,
-  VACUUM_AFTER_SAVE,
-  HANDLE_SAVE_FAILURE,
-  PURGE_ENTRIES,
-  SYNCAPI,
-};
-
-// Make sure to update this if you update WriterTag.
-std::string WriterTagToString(WriterTag writer_tag);
-
-class SYNC_EXPORT BaseTransaction {
- public:
-  static Id root_id();
-
-  Directory* directory() const;
-
-  virtual ~BaseTransaction();
-
-  // This should be called when a database corruption is detected and there is
-  // no way for us to recover short of wiping the database clean. When this is
-  // called we set a bool in the transaction. The caller has to unwind the
-  // stack. When the destructor for the transaction is called it acts upon the
-  // bool and calls the Directory to handle the unrecoverable error.
-  void OnUnrecoverableError(const tracked_objects::Location& location,
-                            const std::string& message);
-
-  bool unrecoverable_error_set() const;
-
- protected:
-  BaseTransaction(const tracked_objects::Location& from_here,
-                  const char* name,
-                  WriterTag writer,
-                  Directory* directory);
-
-  void Lock();
-  void Unlock();
-
-  // This should be called before unlocking because it calls the Direcotry's
-  // OnUnrecoverableError method which is not protected by locks and could
-  // be called from any thread. Holding the transaction lock ensures only one
-  // thread could call the method at a time.
-  void HandleUnrecoverableErrorIfSet();
-
-  const tracked_objects::Location from_here_;
-  const char* const name_;
-  WriterTag writer_;
-  Directory* const directory_;
-
-  // Error information.
-  bool unrecoverable_error_set_;
-  tracked_objects::Location unrecoverable_error_location_;
-  std::string unrecoverable_error_msg_;
-
- private:
-  friend class Entry;
-  DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
-};
-
-}  // namespace syncable
-}  // namespace syncer
-
-#endif  // SYNC_SYNCABLE_SYNCABLE_BASE_TRANSACTION_H_