sync: Introduce ModelTypeRegistry and helpers

sync/internal_api/public/internal_components_factory.h

Index: sync/internal_api/public/internal_components_factory.h
diff --git a/sync/internal_api/public/internal_components_factory.h b/sync/internal_api/public/internal_components_factory.h
index 616457d98a251241f6d8702aa7667f48102ff5f2..cc959ad73dcc2fe9500e43d3f09284d0b7607d15 100644
--- a/sync/internal_api/public/internal_components_factory.h
+++ b/sync/internal_api/public/internal_components_factory.h
@@ -24,6 +24,7 @@ class SyncEngineEventListener;
 class CancelationSignal;
 class SyncScheduler;
 class TrafficRecorder;
+class ModelTypeRegistry;

[Nicolas Zea, 2014/01/04 02:09:34]

nit: typically these should be in abc order

[rlarocque, 2014/01/06 20:03:33]

Done.  Sorted the entire list.

 
 namespace sessions {
 class DebugInfoGetter;
@@ -82,11 +83,11 @@ class SYNC_EXPORT InternalComponentsFactory {
   virtual scoped_ptr<sessions::SyncSessionContext> BuildContext(
       ServerConnectionManager* connection_manager,
       syncable::Directory* directory,
-      const std::vector<ModelSafeWorker*>& workers,
       ExtensionsActivity* extensions_activity,
       const std::vector<SyncEngineEventListener*>& listeners,
       sessions::DebugInfoGetter* debug_info_getter,
       TrafficRecorder* traffic_recorder,
+      ModelTypeRegistry* model_type_registry,
       const std::string& invalidator_client_id) = 0;
 
   virtual scoped_ptr<syncable::DirectoryBackingStore>