[USS] Store supports hosting multiple datatypes per database

sync/api/model_type_store.h

Index: sync/api/model_type_store.h
diff --git a/sync/api/model_type_store.h b/sync/api/model_type_store.h
index d09cf87b9c691b19828c2a2f30dd4c1b763a6579..487751bee42a30523f2e1c6d42b1efab5b7b2d7c 100644
--- a/sync/api/model_type_store.h
+++ b/sync/api/model_type_store.h
@@ -12,6 +12,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "sync/base/sync_export.h"
+#include "sync/internal_api/public/base/model_type.h"
 
 namespace base {
 class SequencedTaskRunner;
@@ -103,6 +104,7 @@ class SYNC_EXPORT ModelTypeStore {
   //
   // In test get task runner from MessageLoop::task_runner().
   static void CreateStore(
+      const syncer::ModelType type,
       const std::string& path,
       scoped_refptr<base::SequencedTaskRunner> blocking_task_runner,
       const InitCallback& callback);