Make dart:developer log more user friendly

runtime/lib/developer.cc

 // Copyright (c) 2015, 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/bootstrap_natives.h"
 
 #include "include/dart_api.h"
 
 #include "vm/debugger.h"
 #include "vm/exceptions.h"
@@ skipping 21 matching lines @@
 
 
 DEFINE_NATIVE_ENTRY(Developer_inspect, 1) {
   GET_NATIVE_ARGUMENT(Instance, inspectee, arguments->NativeArgAt(0));
   Service::SendInspectEvent(isolate, inspectee);
   return inspectee.raw();
 }
 
 
 DEFINE_NATIVE_ENTRY(Developer_log, 8) {
-  GET_NON_NULL_NATIVE_ARGUMENT(Integer, sequence, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(String, message, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(Integer, timestamp, arguments->NativeArgAt(1));
-  GET_NON_NULL_NATIVE_ARGUMENT(Smi, level, arguments->NativeArgAt(2));
-  GET_NON_NULL_NATIVE_ARGUMENT(String, name, arguments->NativeArgAt(3));
-  GET_NON_NULL_NATIVE_ARGUMENT(String, message, arguments->NativeArgAt(4));
+  GET_NON_NULL_NATIVE_ARGUMENT(Integer, sequence, arguments->NativeArgAt(2));
+  GET_NON_NULL_NATIVE_ARGUMENT(Smi, level, arguments->NativeArgAt(3));
+  GET_NON_NULL_NATIVE_ARGUMENT(String, name, arguments->NativeArgAt(4));
   GET_NATIVE_ARGUMENT(Instance, dart_zone, arguments->NativeArgAt(5));
   GET_NATIVE_ARGUMENT(Instance, error, arguments->NativeArgAt(6));
   GET_NATIVE_ARGUMENT(Instance, stack_trace, arguments->NativeArgAt(7));
   Service::SendLogEvent(isolate,
                         sequence.AsInt64Value(),
                         timestamp.AsInt64Value(),
                         level.Value(),
                         name,
                         message,
                         dart_zone,
                         error,
                         stack_trace);
   return Object::null();
 }
 
 }  // namespace dart