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

sync/util/extensions_activity.h

-// Copyright 2013 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_UTIL_EXTENSIONS_ACTIVITY_H_
-#define SYNC_UTIL_EXTENSIONS_ACTIVITY_H_
-
-#include <stdint.h>
-
-#include <map>
-#include <string>
-
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
-#include "sync/base/sync_export.h"
-
-namespace syncer {
-
-// A storage to record usage of extensions APIs to send to sync
-// servers, with the ability to purge data once sync servers have
-// acknowledged it (successful commit response).
-class SYNC_EXPORT ExtensionsActivity
-    : public base::RefCountedThreadSafe<ExtensionsActivity> {
- public:
-  // A data record of activity performed by extension |extension_id|.
-  struct SYNC_EXPORT Record {
-    Record();
-    ~Record();
-
-    // The human-readable ID identifying the extension responsible
-    // for the activity reported in this Record.
-    std::string extension_id;
-
-    // How many times the extension successfully invoked a write
-    // operation through the bookmarks API since the last CommitMessage.
-    uint32_t bookmark_write_count;
-  };
-
-  typedef std::map<std::string, Record> Records;
-
-  ExtensionsActivity();
-
-  // Fill |buffer| with all current records and then clear the
-  // internal records. Called on sync thread to append records to sync commit
-  // message.
-  void GetAndClearRecords(Records* buffer);
-
-  // Merge |records| with the current set of records. Called on sync thread to
-  // put back records if sync commit failed.
-  void PutRecords(const Records& records);
-
-  // Increment write count of the specified extension.
-  void UpdateRecord(const std::string& extension_id);
-
- private:
-  friend class base::RefCountedThreadSafe<ExtensionsActivity>;
-  ~ExtensionsActivity();
-
-  Records records_;
-  mutable base::Lock records_lock_;
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_UTIL_EXTENSIONS_ACTIVITY_H_