Apps/Extensions Sync refactoring -- delete most of the old glue, implement new sync API.

chrome/browser/sync/glue/extension_sync_traits.h

-// Copyright (c) 2011 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 CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_TRAITS_H_
-#define CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_TRAITS_H_
-#pragma once
-
-#include "chrome/browser/sync/syncable/model_type.h"
-
-class Extension;
-struct UninstalledExtensionInfo;
-
-namespace sync_api {
-class BaseNode;
-class WriteNode;
-}  // namespace sync_api
-
-namespace sync_pb {
-class EntitySpecifics;
-class ExtensionSpecifics;
-}  // namespace sync_pb
-
-namespace browser_sync {
-
-typedef bool (*IsValidAndSyncablePredicate)(const Extension&);
-
-typedef bool (*ShouldHandleExtensionUninstallPredicate)(
-    const UninstalledExtensionInfo&);
-
-// ExtensionSpecificsGetter : BaseNode -> ExtensionSpecifics
-typedef const sync_pb::ExtensionSpecifics& (*ExtensionSpecificsGetter)(
-    const sync_api::BaseNode&);
-
-// A function that sets the appropriate member of the given BaseNode
-// to the given ExtensionSpecifics.
-typedef void (*ExtensionSpecificsSetter)(
-    const sync_pb::ExtensionSpecifics&, sync_api::WriteNode*);
-
-// A function that tries to retrieve an ExtensionSpecifics from an
-// EntitySpecifics.  Returns true and fills in the second argument iff
-// successful.
-typedef bool (*ExtensionSpecificsEntityGetter)(
-    const sync_pb::EntitySpecifics&, sync_pb::ExtensionSpecifics*);
-
-// Represents the properties needed for syncing data types that
-// involve extensions (e.g., "real" extensions, apps).
-struct ExtensionSyncTraits {
-  ExtensionSyncTraits(
-      syncable::ModelType model_type,
-      IsValidAndSyncablePredicate is_valid_and_syncable,
-      const char* root_node_tag,
-      ExtensionSpecificsGetter extension_specifics_getter,
-      ExtensionSpecificsSetter extension_specifics_setter,
-      ExtensionSpecificsEntityGetter extension_specifics_entity_getter);
-  ~ExtensionSyncTraits();
-
-  // The sync type for the data type.
-  const syncable::ModelType model_type;
-  // A checker to make sure that the downloaded extension is valid and
-  // syncable.
-  const IsValidAndSyncablePredicate is_valid_and_syncable;
-  // The tag with which the top-level data type node is marked.
-  const char* const root_node_tag;
-  // The function that retrieves a ExtensionSpecifics reference (which
-  // may be embedded in another specifics object) from a sync node.
-  const ExtensionSpecificsGetter extension_specifics_getter;
-  // The function that embeds an ExtensionSpecifics into a sync node.
-  const ExtensionSpecificsSetter extension_specifics_setter;
-  // The function that retrieves a ExtensionSpecifics (if possible)
-  // from an EntitySpecifics.
-  ExtensionSpecificsEntityGetter extension_specifics_entity_getter;
-};
-
-// Gets traits for extensions sync.
-ExtensionSyncTraits GetExtensionSyncTraits();
-
-// Gets traits for apps sync.
-ExtensionSyncTraits GetAppSyncTraits();
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_TRAITS_H_