Add option to get only reference.

runtime/vm/service.cc

 // Copyright (c) 2013, 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/service.h"
 
 #include "include/dart_api.h"
 #include "platform/globals.h"
 
 #include "vm/compiler.h"
@@ skipping 2339 matching lines @@
 
 
 static bool HandleAddress(Isolate* isolate, JSONStream* js) {
   uword addr = 0;
   if (js->num_arguments() != 2 ||
       !GetUnsignedIntegerId(js->GetArgument(1), &addr, 16)) {
     static const uword kExampleAddr = static_cast<uword>(kIntptrMax / 7);
     PrintError(js, "Must specify address: address/" Px ".", kExampleAddr);
     return true;
   }
+  bool ref = js->HasOption("ref") && js->OptionIs("ref", "true");
   Object& object = Object::Handle(isolate);
   {
     NoGCScope no_gc;
     ContainsAddressVisitor visitor(isolate, addr);
     object = isolate->heap()->FindObject(&visitor);
   }
-  object.PrintJSON(js, false);
+  object.PrintJSON(js, ref);
   return true;
 }
 
 
 static bool HandleMalformedJson(Isolate* isolate, JSONStream* js) {
   JSONObject jsobj(js);
   jsobj.AddProperty("a", "a");
   JSONObject jsobj1(js);
   jsobj1.AddProperty("a", "a");
   JSONObject jsobj2(js);
@@ skipping 402 matching lines @@
   while (current != NULL) {
     if (strcmp(name, current->name()) == 0) {
       return current;
     }
     current = current->next();
   }
   return NULL;
 }
 
 }  // namespace dart