Add @JSName annotation for native fields and methods.

sdk/lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate

Index: sdk/lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate
diff --git a/sdk/lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate b/sdk/lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate
index c40b2bb1a66323ce9deacee7402760ad7abaf128..27f8961e45cce7e51ad1e59769dd3bddf6fe848c 100644
--- a/sdk/lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate
+++ b/sdk/lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate
@@ -42,7 +42,8 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
     return db._transaction(stores, intMode);
   }
 
-  IDBTransaction _transaction(stores, mode) native 'transaction';
+  @JSName('transaction')
+  IDBTransaction _transaction(stores, mode) native;
 
   static bool _hasNumericMode(txn) =>
       JS('bool', 'typeof(#.mode) === "number"', txn);