Track async causal stack traces

runtime/vm/object_service.cc

 // Copyright (c) 2016, 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/debugger.h"
 #include "vm/disassembler.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 1451 matching lines @@
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 void StackTrace::PrintJSONImpl(JSONStream* stream, bool ref) const {
   JSONObject jsobj(stream);
   PrintSharedInstanceJSON(&jsobj, ref);
   jsobj.AddProperty("kind", "StackTrace");
   jsobj.AddServiceId(*this);
   intptr_t idx = 0;
-  jsobj.AddProperty("valueAsString", ToCStringInternal(&idx));
+  jsobj.AddProperty("valueAsString", ToCStringInternal(*this, &idx));
 }
 
 
 void RegExp::PrintJSONImpl(JSONStream* stream, bool ref) const {
   JSONObject jsobj(stream);
   PrintSharedInstanceJSON(&jsobj, ref);
   jsobj.AddProperty("kind", "RegExp");
   jsobj.AddServiceId(*this);
 
   jsobj.AddProperty("pattern", String::Handle(pattern()));
@@ skipping 67 matching lines @@
   jsobj.AddProperty("mirrorReferent", referent_handle);
 }
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 #endif
 
 }  // namespace dart