Include 'fixedId' key when printing service ids

runtime/vm/metrics.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/metrics.h"
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
 #include "vm/native_entry.h"
 #include "vm/runtime_entry.h"
@@ skipping 64 matching lines @@
 }
 
 
 void Metric::PrintJSON(JSONStream* stream) {
   JSONObject obj(stream);
   obj.AddProperty("type", "Counter");
   obj.AddProperty("name", name_);
   obj.AddProperty("description", description_);
   obj.AddProperty("unit", UnitString(unit()));
   if (isolate_ == NULL) {
-    obj.AddPropertyF("id", "vm/metrics/%s", name_);
+    obj.AddFixedServiceId("vm/metrics/%s", name_);
   } else {
-    obj.AddPropertyF("id", "metrics/native/%s", name_);
+    obj.AddFixedServiceId("metrics/native/%s", name_);
   }
   // TODO(johnmccutchan): Overflow?
   double value_as_double = static_cast<double>(Value());
   obj.AddProperty("value", value_as_double);
 }
 
 
 bool Metric::NameExists(Metric* head, const char* name) {
   ASSERT(name != NULL);
   while (head != NULL) {
@@ skipping 143 matching lines @@
 
 
 void Metric::InitOnce() {
 #define VM_METRIC_INIT(type, variable, name, unit)                             \
   vm_metric_##variable##_.Init(name, NULL, Metric::unit);
   VM_METRIC_LIST(VM_METRIC_INIT);
 #undef VM_METRIC_INIT
 }
 
 }  // namespace dart