Add a weak property type to the virtual machine.

runtime/vm/object_store.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
@@ skipping 41 matching lines @@
     external_int16_array_class_(Class::null()),
     external_uint16_array_class_(Class::null()),
     external_int32_array_class_(Class::null()),
     external_uint32_array_class_(Class::null()),
     external_int64_array_class_(Class::null()),
     external_uint64_array_class_(Class::null()),
     external_float32_array_class_(Class::null()),
     external_float64_array_class_(Class::null()),
     stacktrace_class_(Class::null()),
     jsregexp_class_(Class::null()),
+    weak_property_class_(Class::null()),
     true_value_(Bool::null()),
     false_value_(Bool::null()),
     symbol_table_(Array::null()),
     canonical_type_arguments_(Array::null()),
     core_library_(Library::null()),
     core_impl_library_(Library::null()),
     math_library_(Library::null()),
     isolate_library_(Library::null()),
     mirrors_library_(Library::null()),
     native_wrappers_library_(Library::null()),
@@ skipping 57 matching lines @@
 void ObjectStore::InitKeywordTable() {
   // Set up the keywords symbol array so that we can access it while scanning.
   Array& keywords = Array::Handle(keyword_symbols());
   ASSERT(keywords.IsNull());
   keywords = Array::New(Token::numKeywords, Heap::kOld);
   ASSERT(!keywords.IsError() && !keywords.IsNull());
   set_keyword_symbols(keywords);
 }
 
 }  // namespace dart