sync: Introduce ModelTypeRegistry and helpers

sync/engine/process_updates_util.h

Index: sync/engine/process_updates_util.h
diff --git a/sync/engine/process_updates_util.h b/sync/engine/process_updates_util.h
index 6e8bc71b859670ce3012a046584b73a6448abf51..428ff570e20a72569193e1a3ec25a6eb57c3f22d 100644
--- a/sync/engine/process_updates_util.h
+++ b/sync/engine/process_updates_util.h
@@ -5,16 +5,11 @@
 #ifndef SYNC_ENGINE_PROCESS_UPDATES_UTIL_H_
 #define SYNC_ENGINE_PROCESS_UPDATES_UTIL_H_
 
-#include <map>
 #include <vector>
 
-#include "base/compiler_specific.h"
-#include "sync/base/sync_export.h"
-#include "sync/engine/syncer_types.h"
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace sync_pb {
-class GetUpdatesResponse;
 class SyncEntity;
 }
 
@@ -29,20 +24,7 @@ class ModelNeutralWriteTransaction;
 class Directory;
 }
 
-class Cryptographer;
-
-// TODO(rlarocque): Move these definitions somewhere else?
 typedef std::vector<const sync_pb::SyncEntity*> SyncEntityList;
-typedef std::map<ModelType, SyncEntityList> TypeSyncEntityMap;
-
-// Given a GetUpdates response, iterates over all the returned items and
-// divides them according to their type.  Outputs a map from model types to
-// received SyncEntities.  The output map will have entries (possibly empty)
-// for all types in |requested_types|.
-void PartitionUpdatesByType(
-    const sync_pb::GetUpdatesResponse& updates,
-    ModelTypeSet requested_types,
-    TypeSyncEntityMap* updates_by_type);
 
 // Processes all the updates associated with a single ModelType.
 void ProcessDownloadedUpdates(
@@ -52,22 +34,6 @@ void ProcessDownloadedUpdates(
     const SyncEntityList& applicable_updates,
     sessions::StatusController* status);
 
-// Checks whether or not an update is fit for processing.
-//
-// The answer may be "no" if the update appears invalid, or it's not releveant
-// (ie. a delete for an item we've never heard of), or other reasons.
-VerifyResult VerifyUpdate(
-    syncable::ModelNeutralWriteTransaction* trans,
-    const sync_pb::SyncEntity& entry,
-    ModelType requested_type);
-
-// If the update passes a series of checks, this function will copy
-// the SyncEntity's data into the SERVER side of the syncable::Directory.
-void ProcessUpdate(
-    const sync_pb::SyncEntity& proto_update,
-    const Cryptographer* cryptographer,
-    syncable::ModelNeutralWriteTransaction* const trans);
-
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_PROCESS_UPDATES_UTIL_H_