More of the concurrent copying collector.

Bug: 12687968
Change-Id: I62f70274d47df6d6cab714df95c518b750ce3105
diff --git a/runtime/java_vm_ext.h b/runtime/java_vm_ext.h
index 749b9fb..c3f0a82 100644
--- a/runtime/java_vm_ext.h
+++ b/runtime/java_vm_ext.h
@@ -104,9 +104,9 @@
 
   void VisitRoots(RootCallback* callback, void* arg) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  void DisallowNewWeakGlobals() EXCLUSIVE_LOCKS_REQUIRED(Locks::mutator_lock_);
-
+  void DisallowNewWeakGlobals() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   void AllowNewWeakGlobals() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void EnsureNewWeakGlobalsDisallowed() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   jobject AddGlobalRef(Thread* self, mirror::Object* obj)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);