ExtendStorageStub added, it is aimed for extending objects backing store when it runs out of space.

src/interface-descriptors.cc

Index: src/interface-descriptors.cc
diff --git a/src/interface-descriptors.cc b/src/interface-descriptors.cc
index 62d710581fd8caf7917a4fd3fed1f7c2dc3c7ab2..e9f76bdf2dbe29b8815abb01b8470aa81757690a 100644
--- a/src/interface-descriptors.cc
+++ b/src/interface-descriptors.cc
@@ -74,6 +74,13 @@ void StoreDescriptor::Initialize(CallInterfaceDescriptorData* data) {
 }
 
 
+void ExtendStorageDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {ContextRegister(), ReceiverRegister(), NameRegister(),
+                          ValueRegister(), MapRegister()};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
 void ElementTransitionAndStoreDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {ContextRegister(), ValueRegister(), MapRegister(),