[observatory] Add an "ownership" analysis for the heap snapshot.

runtime/vm/object_graph.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 "vm/object_graph.h"
 
 #include "vm/dart.h"
 #include "vm/dart_api_state.h"
 #include "vm/growable_array.h"
 #include "vm/isolate.h"
@@ skipping 616 matching lines @@
   isolate()->heap()->new_space()->Evacuate();
   HeapIterationScope iteration_scope(Thread::Current(), true);
 
   RawObject* kRootAddress = reinterpret_cast<RawObject*>(kHeapObjectTag);
   const intptr_t kRootCid = kIllegalCid;
   RawObject* kStackAddress =
       reinterpret_cast<RawObject*>(kObjectAlignment + kHeapObjectTag);
 
   stream->WriteUnsigned(kObjectAlignment);
   stream->WriteUnsigned(kStackCid);
+  stream->WriteUnsigned(kFieldCid);
+  stream->WriteUnsigned(isolate()->class_table()->NumCids());
 
   if (roots == kVM) {
     // Write root "object".
     WriteHeader(kRootAddress, 0, kRootCid, stream);
     WritePointerVisitor ptr_writer(isolate(), stream, false);
     isolate()->VisitObjectPointers(&ptr_writer, false);
     stream->WriteUnsigned(0);
   } else {
     {
       // Write root "object".
@@ skipping 24 matching lines @@
   intptr_t object_count = visitor.count();
   if (roots == kVM) {
     object_count += 1;  // root
   } else {
     object_count += 2;  // root and stack
   }
   return object_count;
 }
 
 }  // namespace dart