Implement safepointing of threads

runtime/vm/object_graph_test.cc

 // Copyright (c) 2014, 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 "platform/assert.h"
 #include "vm/object_graph.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
@@ skipping 20 matching lines @@
   int size() const { return size_; }
 
  private:
   int count_;
   intptr_t size_;
   RawObject* skip_;
   RawObject* expected_parent_;
 };
 
 
-TEST_CASE(ObjectGraph) {
+VM_TEST_CASE(ObjectGraph) {
   Isolate* isolate = thread->isolate();
   // Create a simple object graph with objects a, b, c, d:
   //  a+->b+->c
   //  +   +
   //  |   v
   //  +-->d
   Array& a = Array::Handle(Array::New(12, Heap::kNew));
   Array& b = Array::Handle(Array::New(2, Heap::kOld));
   Array& c = Array::Handle(Array::New(0, Heap::kOld));
   Array& d = Array::Handle(Array::New(0, Heap::kOld));
@@ skipping 80 matching lines @@
       Array& expected_a = Array::Handle();
       expected_a ^= path.At(4);
       EXPECT(expected_c.raw() == c.raw());
       EXPECT(expected_b.raw() == a.At(10));
       EXPECT(expected_a.raw() == a.raw());
     }
   }
 }
 
 }  // namespace dart