Retained size for instance in Observatory.

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 35 matching lines @@
   //  |   v
   //  +-->d
   Array& a = Array::Handle(Array::New(2, 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));
   a.SetAt(0, b);
   b.SetAt(0, c);
   b.SetAt(1, d);
   a.SetAt(1, d);
+  intptr_t a_size = a.raw()->Size();
   intptr_t b_size = b.raw()->Size();
   intptr_t c_size = c.raw()->Size();
+  intptr_t d_size = d.raw()->Size();
   {
     // No more allocation; raw pointers ahead.
     NoGCScope no_gc_scope;
     RawObject* b_raw = b.raw();
     // Clear handles to cut unintended retained paths.
     b = Array::null();
     c = Array::null();
     d = Array::null();
     ObjectGraph graph(isolate);
     {
@@ skipping 11 matching lines @@
       // Like above, but iterate over the entire isolate. The counts and sizes
       // are thus larger, but the difference should still be just 'b' and 'c'.
       Counter with(Object::null(), Object::null());
       graph.IterateObjects(&with);
       Counter without(b_raw, a.raw());
       graph.IterateObjects(&without);
       EXPECT_EQ(2, with.count() - without.count());
       EXPECT_EQ(b_size + c_size,
                 with.size() - without.size());
     }
+    EXPECT_EQ(a_size + b_size + c_size + d_size,
+              graph.SizeRetainedByInstance(a));
   }
 }
 
 }  // namespace dart