Add WeakMap to v8.h

test/cctest/test-weaksets.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 40 matching lines @@
     HandleScope scope(isolate);
     Handle<ObjectHashTable> table = ObjectHashTable::New(isolate, 1);
     weakset->set_table(*table);
   }
   return weakset;
 }
 
 static void PutIntoWeakSet(Handle<JSWeakSet> weakset,
                            Handle<JSObject> key,
                            Handle<Object> value) {
-  Handle<ObjectHashTable> table = ObjectHashTable::Put(
-      Handle<ObjectHashTable>(ObjectHashTable::cast(weakset->table())),
-      Handle<JSObject>(JSObject::cast(*key)),
-      value);
-  weakset->set_table(*table);
+  Runtime::WeakCollectionSet(weakset, key, value);
 }
 
 static int NumberOfWeakCalls = 0;
 static void WeakPointerCallback(
     const v8::WeakCallbackData<v8::Value, void>& data) {
   std::pair<v8::Persistent<v8::Value>*, int>* p =
       reinterpret_cast<std::pair<v8::Persistent<v8::Value>*, int>*>(
           data.GetParameter());
   DCHECK_EQ(1234, p->second);
   NumberOfWeakCalls++;
@@ skipping 172 matching lines @@
                    Handle<Smi>(Smi::FromInt(i), isolate));
   }
 
   // Force compacting garbage collection. The subsequent collections are used
   // to verify that key references were actually updated.
   CHECK(FLAG_always_compact);
   heap->CollectAllGarbage(Heap::kNoGCFlags);
   heap->CollectAllGarbage(Heap::kNoGCFlags);
   heap->CollectAllGarbage(Heap::kNoGCFlags);
 }