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

sync/syncable/syncable_write_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_WRITE_TRANSACTION_H_
-#define SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_
-
-#include <stdint.h>
-
-#include <vector>
-
-#include "base/macros.h"
-#include "sync/base/sync_export.h"
-#include "sync/syncable/entry_kernel.h"
-#include "sync/syncable/syncable_base_write_transaction.h"
-
-namespace syncer {
-namespace syncable {
-
-SYNC_EXPORT extern const int64_t kInvalidTransactionVersion;
-
-// Locks db in constructor, unlocks in destructor.
-class SYNC_EXPORT WriteTransaction : public BaseWriteTransaction {
- public:
-  WriteTransaction(const tracked_objects::Location& from_here,
-                   WriterTag writer, Directory* directory);
-
-  // Constructor used for getting back transaction version after making sync
-  // API changes to one model. If model is changed by the transaction,
-  // the new transaction version of the model and modified nodes will be saved
-  // in |transaction_version| upon destruction of the transaction. If model is
-  // not changed,  |transaction_version| will be kInvalidTransactionVersion.
-  WriteTransaction(const tracked_objects::Location& from_here,
-                   Directory* directory,
-                   int64_t* transaction_version);
-
-  ~WriteTransaction() override;
-
-  void TrackChangesTo(const EntryKernel* entry) override;
-
- protected:
-  // Overridden by tests.
-  virtual void NotifyTransactionComplete(ModelTypeSet models_with_changes);
-
- private:
-  friend class MutableEntry;
-
-  // Clears |mutations_|.
-  ImmutableEntryKernelMutationMap RecordMutations();
-
-  void UnlockAndNotify(const ImmutableEntryKernelMutationMap& mutations);
-
-  ModelTypeSet NotifyTransactionChangingAndEnding(
-      const ImmutableEntryKernelMutationMap& mutations);
-
-  // Increment versions of the models whose entries are modified and set the
-  // version on the changed entries.
-  void UpdateTransactionVersion(const std::vector<int64_t>& entry_changed);
-
-  // Only the original fields are filled in until |RecordMutations()|.
-  // We use a mutation map instead of a kernel set to avoid copying.
-  EntryKernelMutationMap mutations_;
-
-  // Stores new transaction version of changed model and nodes if model is
-  // indeed changed. kInvalidTransactionVersion otherwise. Not owned.
-  int64_t* transaction_version_;
-
-  DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
-};
-
-}  // namespace syncable
-}  // namespace syncer
-
-#endif  // SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_