[sync] Purge directory data when migrating to USS

components/sync/base/model_type.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 COMPONENTS_SYNC_BASE_MODEL_TYPE_H_
 #define COMPONENTS_SYNC_BASE_MODEL_TYPE_H_
 
 #include <map>
 #include <memory>
 #include <ostream>
 #include <set>
 #include <string>
 
 #include "base/logging.h"
+#include "components/reading_list/core/reading_list_enable_flags.h"
 #include "components/sync/base/enum_set.h"
 
 namespace base {
 class ListValue;
 class Value;
 }
 
 namespace sync_pb {
 class EntitySpecifics;
 class SyncEntity;
@@ skipping 169 matching lines @@
 ModelType GetModelTypeFromSpecifics(const sync_pb::EntitySpecifics& specifics);
 
 // Protocol types are those types that have actual protocol buffer
 // representations. This distinguishes them from Proxy types, which have no
 // protocol representation and are never sent to the server.
 ModelTypeSet ProtocolTypes();
 
 // These are the normal user-controlled types. This is to distinguish from
 // ControlTypes which are always enabled.  Note that some of these share a
 // preference flag, so not all of them are individually user-selectable.
-ModelTypeSet UserTypes();
+constexpr ModelTypeSet UserTypes() {
+  return ModelTypeSet::FromRange(FIRST_USER_MODEL_TYPE, LAST_USER_MODEL_TYPE);
+}
 
 // These are the user-selectable data types.
-ModelTypeSet UserSelectableTypes();
-bool IsUserSelectableType(ModelType model_type);
+constexpr ModelTypeSet UserSelectableTypes() {
+  return ModelTypeSet({
+    BOOKMARKS, PREFERENCES, PASSWORDS, AUTOFILL, THEMES, TYPED_URLS, EXTENSIONS,
+        APPS,
+#if BUILDFLAG(ENABLE_READING_LIST)
+        READING_LIST,
+#endif
+        PROXY_TABS
+  });
+}
+
+constexpr bool IsUserSelectableType(ModelType model_type) {
+  return UserSelectableTypes().Has(model_type);
+}
+
 ModelTypeNameMap GetUserSelectableTypeNameMap();
 
 // This is the subset of UserTypes() that can be encrypted.
 ModelTypeSet EncryptableUserTypes();
 
 // This is the subset of UserTypes() that have priority over other types.  These
 // types are synced before other user types and are never encrypted.
-ModelTypeSet PriorityUserTypes();
-
-// Proxy types are placeholder types for handling implicitly enabling real
-// types. They do not exist at the server, and are simply used for
-// UI/Configuration logic.
-ModelTypeSet ProxyTypes();
+constexpr ModelTypeSet PriorityUserTypes() {
+  return ModelTypeSet({DEVICE_INFO, PRIORITY_PREFERENCES});
+}
 
 // Returns a list of all control types.
 //
 // The control types are intended to contain metadata nodes that are essential
 // for the normal operation of the syncer.  As such, they have the following
 // special properties:
 // - They are downloaded early during SyncBackend initialization.
 // - They are always enabled.  Users may not disable these types.
 // - Their contents are not encrypted automatically.
 // - They support custom update application and conflict resolution logic.
 // - All change processing occurs on the sync thread (GROUP_PASSIVE).
-ModelTypeSet ControlTypes();
+constexpr ModelTypeSet ControlTypes() {
+  return ModelTypeSet::FromRange(FIRST_CONTROL_MODEL_TYPE,
+                                 LAST_CONTROL_MODEL_TYPE);
+}
+
+// Proxy types are placeholder types for handling implicitly enabling real
+// types. They do not exist at the server, and are simply used for
+// UI/Configuration logic.
+constexpr ModelTypeSet ProxyTypes() {
+  return ModelTypeSet::FromRange(FIRST_PROXY_TYPE, LAST_PROXY_TYPE);
+}
 
 // Returns true if this is a control type.
 //
 // See comment above for more information on what makes these types special.
-bool IsControlType(ModelType model_type);
+constexpr bool IsControlType(ModelType model_type) {
+  return ControlTypes().Has(model_type);
+}
 
 // Core types are those data types used by sync's core functionality (i.e. not
 // user data types). These types are always enabled, and include ControlTypes().
 //
 // The set of all core types.
 ModelTypeSet CoreTypes();
 // Those core types that have high priority (includes ControlTypes()).
 ModelTypeSet PriorityCoreTypes();
 
 // Determine a model type from the field number of its associated
@@ skipping 102 matching lines @@
 
 // Returns true if |model_type| supports parent-child hierarchy or entries.
 bool TypeSupportsHierarchy(ModelType model_type);
 
 // Returns true if |model_type| supports ordering of sibling entries.
 bool TypeSupportsOrdering(ModelType model_type);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_MODEL_TYPE_H_