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

components/sync_driver/local_device_info_provider.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_SYNC_DRIVER_LOCAL_DEVICE_INFO_PROVIDER_H_
-#define COMPONENTS_SYNC_DRIVER_LOCAL_DEVICE_INFO_PROVIDER_H_
-
-#include <memory>
-#include <string>
-
-#include "base/callback_list.h"
-
-namespace base {
-class TaskRunner;
-}
-
-namespace sync_driver {
-
-class DeviceInfo;
-
-// Interface for providing sync specific information about the
-// local device.
-class LocalDeviceInfoProvider {
- public:
-  typedef base::CallbackList<void(void)>::Subscription Subscription;
-
-  virtual ~LocalDeviceInfoProvider() {}
-
-  // Returns sync's representation of the local device info, or nullptr if the
-  // device info is unavailable. The returned object is fully owned by
-  // LocalDeviceInfoProvider; it must not be freed by the caller and should not
-  // be stored.
-  virtual const DeviceInfo* GetLocalDeviceInfo() const = 0;
-
-  // Constructs a user agent string (ASCII) suitable for use by the syncapi
-  // for any HTTP communication. This string is used by the sync backend for
-  // classifying client types when calculating statistics.
-  virtual std::string GetSyncUserAgent() const = 0;
-
-  // Returns a GUID string used for creation of the machine tag for
-  // this local session; an empty sting if LocalDeviceInfoProvider hasn't been
-  // initialized yet.
-  virtual std::string GetLocalSyncCacheGUID() const = 0;
-
-  // Starts initializing local device info.
-  virtual void Initialize(
-      const std::string& cache_guid,
-      const std::string& signin_scoped_device_id,
-      const scoped_refptr<base::TaskRunner>& blocking_task_runner) = 0;
-
-  // Registers a callback to be called when local device info becomes available.
-  // The callback will remain registered until the
-  // returned Subscription is destroyed, which must occur before the
-  // CallbackList is destroyed.
-  virtual std::unique_ptr<Subscription> RegisterOnInitializedCallback(
-      const base::Closure& callback) = 0;
-
-  // Clears all cached data, returning to an uninitialized state.
-  virtual void Clear() = 0;
-};
-
-}  // namespace sync_driver
-
-#endif  // COMPONENTS_SYNC_DRIVER_LOCAL_DEVICE_INFO_PROVIDER_H_