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

components/sync_driver/startup_controller.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_STARTUP_CONTROLLER_H_
-#define COMPONENTS_SYNC_DRIVER_STARTUP_CONTROLLER_H_
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "base/time/time.h"
-#include "components/sync/base/model_type.h"
-
-namespace sync_driver {
-class SyncPrefs;
-}
-
-namespace browser_sync {
-
-// This class is used by ProfileSyncService to manage all logic and state
-// pertaining to initialization of the SyncBackendHost (colloquially referred
-// to as "the backend").
-class StartupController {
- public:
-  StartupController(const sync_driver::SyncPrefs* sync_prefs,
-                    base::Callback<bool()> can_start,
-                    base::Closure start_backend);
-  ~StartupController();
-
-  // Starts up sync if it is requested by the user and preconditions are met.
-  // Returns true if these preconditions are met, although does not imply
-  // the backend was started.
-  bool TryStart();
-
-  // Same as TryStart() above, but bypasses deferred startup and the first setup
-  // complete check.
-  bool TryStartImmediately();
-
-  // Called when a datatype (SyncableService) has a need for sync to start
-  // ASAP, presumably because a local change event has occurred but we're
-  // still in deferred start mode, meaning the SyncableService hasn't been
-  // told to MergeDataAndStartSyncing yet.
-  // It is expected that |type| is a currently active datatype.
-  void OnDataTypeRequestsSyncStartup(syncer::ModelType type);
-
-  // Prepares this object for a new attempt to start sync, forgetting
-  // whether or not preconditions were previously met.
-  // NOTE: This resets internal state managed by this class, but does not
-  // touch values that are explicitly set and reset by higher layers to
-  // tell this class whether a setup UI dialog is being shown to the user.
-  // See setup_in_progress_.
-  void Reset(const syncer::ModelTypeSet registered_types);
-
-  // Sets the setup in progress flag and tries to start sync if it's true.
-  void SetSetupInProgress(bool setup_in_progress);
-
-  bool IsSetupInProgress() const { return setup_in_progress_; }
-  base::Time start_backend_time() const { return start_backend_time_; }
-  std::string GetBackendInitializationStateString() const;
-
-  void OverrideFallbackTimeoutForTest(const base::TimeDelta& timeout);
-
- private:
-  enum StartUpDeferredOption {
-    STARTUP_BACKEND_DEFERRED,
-    STARTUP_IMMEDIATE
-  };
-  // Returns true if all conditions to start the backend are met.
-  bool StartUp(StartUpDeferredOption deferred_option);
-  void OnFallbackStartupTimerExpired();
-
-  // Records time spent in deferred state with UMA histograms.
-  void RecordTimeDeferred();
-
-  // If true, will bypass the FirstSetupComplete check when triggering sync
-  // startup.
-  bool bypass_setup_complete_;
-
-  // True if we should start sync ASAP because either a SyncableService has
-  // requested it, or we're done waiting for a sign and decided to go ahead.
-  bool received_start_request_;
-
-  // The time that StartUp() is called. This is used to calculate time spent
-  // in the deferred state; that is, after StartUp and before invoking the
-  // start_backend_ callback.
-  base::Time start_up_time_;
-
-  // If |true|, there is setup UI visible so we should not start downloading
-  // data types.
-  // Note: this is explicitly controlled by higher layers (UI) and is meant to
-  // reflect what the UI claims the setup state to be. Therefore, only set this
-  // due to explicit requests to do so via SetSetupInProgress.
-  bool setup_in_progress_;
-
-  const sync_driver::SyncPrefs* sync_prefs_;
-
-  // A function that can be invoked repeatedly to determine whether sync can be
-  // started. |start_backend_| should not be invoked unless this returns true.
-  base::Callback<bool()> can_start_;
-
-  // The callback we invoke when it's time to call expensive
-  // startup routines for the sync backend.
-  base::Closure start_backend_;
-
-  // The time at which we invoked the start_backend_ callback.
-  base::Time start_backend_time_;
-
-  base::TimeDelta fallback_timeout_;
-
-  // Used to compute preferred_types from SyncPrefs as-needed.
-  syncer::ModelTypeSet registered_types_;
-
-  base::WeakPtrFactory<StartupController> weak_factory_;
-};
-
-}  // namespace browser_sync
-
-#endif  // COMPONENTS_SYNC_DRIVER_STARTUP_CONTROLLER_H_