[Sync] Move SyncBackendRegistrar to engine/

components/sync/driver/glue/sync_backend_registrar.h

Index: components/sync/driver/glue/sync_backend_registrar.h
diff --git a/components/sync/driver/glue/sync_backend_registrar.h b/components/sync/driver/glue/sync_backend_registrar.h
deleted file mode 100644
index 2f8f355646d3c7875d328d64f90363ccfd3d2b54..0000000000000000000000000000000000000000
--- a/components/sync/driver/glue/sync_backend_registrar.h
+++ /dev/null
@@ -1,173 +0,0 @@
-// 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 COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_REGISTRAR_H_
-#define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_REGISTRAR_H_
-
-#include <stdint.h>
-
-#include <map>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread_checker.h"
-#include "components/sync/base/model_type.h"
-#include "components/sync/engine/model_safe_worker.h"
-#include "components/sync/engine/sync_manager.h"
-
-namespace syncer {
-
-class ChangeProcessor;
-struct UserShare;
-
-// A class that keep track of the workers, change processors, and
-// routing info for the enabled sync types, and also routes change
-// events to the right processors.
-class SyncBackendRegistrar : public SyncManager::ChangeDelegate {
- public:
-  using ModelSafeWorkerFactory =
-      base::Callback<scoped_refptr<ModelSafeWorker>(ModelSafeGroup)>;
-
-  // |name| is used for debugging. Must be created on the UI thread.
-  SyncBackendRegistrar(const std::string& name,
-                       ModelSafeWorkerFactory worker_factory);
-
-  // A SyncBackendRegistrar is owned by a SyncBackendHostImpl. It is destroyed
-  // by SyncBackendHostImpl::Shutdown() which performs the following operations
-  // on the UI thread:
-  //
-  //   1) Call SyncBackendRegistrar::RequestWorkerStopOnUIThread().
-  //   2) Post a SyncBackendHostCore::DoShutdown() task to the sync thread. This
-  //      task destroys SyncManager which holds a SyncBackendRegistrar pointer.
-  //   3) Take ownership of the sync thread.
-  //   4) Post a task to delete the SyncBackendRegistrar on the sync thread.
-  //      When this task runs, there are no remaining pointers to the
-  //      SyncBackendRegistrar.
-  ~SyncBackendRegistrar() override;
-
-  // Adds |type| to set of non-blocking types. These types are assigned to
-  // GROUP_NON_BLOCKING model safe group and will be treated differently in
-  // ModelTypeRegistry. Unlike directory types, non-blocking types always stay
-  // assigned to GROUP_NON_BLOCKING group.
-  void RegisterNonBlockingType(ModelType type);
-
-  // Informs the SyncBackendRegistrar of the currently enabled set of types.
-  // These types will be placed in the passive group.  This function should be
-  // called exactly once during startup.
-  void SetInitialTypes(ModelTypeSet initial_types);
-
-  // Informs SyncBackendRegistrar about non-blocking type loaded from local
-  // storage. Initial sync was already performed for this type, therefore its
-  // data shouldn't be downloaded as part of configuration.
-  void AddRestoredNonBlockingType(ModelType type);
-
-  // Returns whether or not we are currently syncing encryption keys.
-  // Must be called on the UI thread.
-  bool IsNigoriEnabled() const;
-
-  // Removes all types in |types_to_remove| from the routing info and
-  // adds all the types in |types_to_add| to the routing info that are
-  // not already there (initially put in the passive group).
-  // |types_to_remove| and |types_to_add| must be disjoint.  Returns
-  // the set of newly-added types.  Must be called on the UI thread.
-  ModelTypeSet ConfigureDataTypes(ModelTypeSet types_to_add,
-                                  ModelTypeSet types_to_remove);
-
-  // Returns the set of enabled types as of the last configuration. Note that
-  // this might be different from the current types in the routing info due
-  // to DeactiveDataType being called separately from ConfigureDataTypes.
-  ModelTypeSet GetLastConfiguredTypes() const;
-
-  // Must be called from the UI thread. (See destructor comment.)
-  void RequestWorkerStopOnUIThread();
-
-  // Activates the given data type (which should belong to the given
-  // group) and starts the given change processor.  Must be called
-  // from |group|'s native thread.
-  void ActivateDataType(ModelType type,
-                        ModelSafeGroup group,
-                        ChangeProcessor* change_processor,
-                        UserShare* user_share);
-
-  // Deactivates the given type if necessary.  Must be called from the
-  // UI thread and not |type|'s native thread.  Yes, this is
-  // surprising: see http://crbug.com/92804.
-  void DeactivateDataType(ModelType type);
-
-  // Returns true only between calls to ActivateDataType(type, ...)
-  // and DeactivateDataType(type).  Used only by tests.
-  bool IsTypeActivatedForTest(ModelType type) const;
-
-  // SyncManager::ChangeDelegate implementation.  May be called from
-  // any thread.
-  void OnChangesApplied(ModelType model_type,
-                        int64_t model_version,
-                        const BaseTransaction* trans,
-                        const ImmutableChangeRecordList& changes) override;
-  void OnChangesComplete(ModelType model_type) override;
-
-  void GetWorkers(std::vector<scoped_refptr<ModelSafeWorker>>* out);
-  void GetModelSafeRoutingInfo(ModelSafeRoutingInfo* out);
-
- private:
-  // Add a worker for |group| to the worker map if one is successfully created
-  // by |worker_factory|.
-  void MaybeAddWorker(ModelSafeWorkerFactory worker_factory,
-                      ModelSafeGroup group);
-
-  // Returns the change processor for the given model, or null if none
-  // exists.  Must be called from |group|'s native thread.
-  ChangeProcessor* GetProcessor(ModelType type) const;
-
-  // Must be called with |lock_| held.  Simply returns the change
-  // processor for the given type, if it exists.  May be called from
-  // any thread.
-  ChangeProcessor* GetProcessorUnsafe(ModelType type) const;
-
-  // Return true if |model_type| lives on the current thread.  Must be
-  // called with |lock_| held.  May be called on any thread.
-  bool IsCurrentThreadSafeForModel(ModelType model_type) const;
-
-  // Returns model safe group that should be assigned to type when it is first
-  // configured (before activation). Returns GROUP_PASSIVE for directory types
-  // and GROUP_NON_BLOCKING for non-blocking types.
-  ModelSafeGroup GetInitialGroupForType(ModelType type) const;
-
-  // Name used for debugging.
-  const std::string name_;
-
-  // Checker for the UI thread (where this object is constructed).
-  base::ThreadChecker ui_thread_checker_;
-
-  // Protects all variables below.
-  mutable base::Lock lock_;
-
-  // Workers created by this SyncBackendRegistrar.
-  std::map<ModelSafeGroup, scoped_refptr<ModelSafeWorker>> workers_;
-
-  // The change processors that handle the different data types.
-  std::map<ModelType, ChangeProcessor*> processors_;
-
-  // Maps ModelType to ModelSafeGroup.
-  ModelSafeRoutingInfo routing_info_;
-
-  // The types that were enabled as of the last configuration. Updated on each
-  // call to ConfigureDataTypes as well as SetInitialTypes.
-  ModelTypeSet last_configured_types_;
-
-  // Set of types with non-blocking implementation (as opposed to directory
-  // based).
-  ModelTypeSet non_blocking_types_;
-
-  DISALLOW_COPY_AND_ASSIGN(SyncBackendRegistrar);
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_REGISTRAR_H_