Remove many features when building product mode

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 62 matching lines @@
     case Metric::kByte: return "byte";
     default:
       UNREACHABLE();
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 void Metric::PrintJSON(JSONStream* stream) {
+  if (!FLAG_support_service) {
+    return;
+  }
   JSONObject obj(stream);
   obj.AddProperty("type", "Counter");
   obj.AddProperty("name", name_);
   obj.AddProperty("description", description_);
   obj.AddProperty("unit", UnitString(unit()));
   if (isolate_ == NULL) {
     obj.AddFixedServiceId("vm/metrics/%s", name_);
   } else {
     obj.AddFixedServiceId("metrics/native/%s", name_);
   }
@@ skipping 240 matching lines @@
 }
 
 
 void MinMetric::SetValue(int64_t new_value) {
   if (new_value < value()) {
     set_value(new_value);
   }
 }
 
 }  // namespace dart