Add product mode:

runtime/tools/gyp/runtime-configurations.gypi

 # Copyright (c) 2012, 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.
 
 {
   'variables': {
     'dart_debug_optimization_level%': '2',
     # If we have not set dart_io_support to 1 in Dart's all.gypi or common.gypi,
     # then do not build the native libraries supporting  dart:io.
     'dart_io_support%': 0,
@@ skipping 13 matching lines @@
   'target_defaults': {
     'configurations': {
 
       'Dart_Base': {
         'abstract': 1,
         'xcode_settings': {
           'GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS': 'YES', # -Woverloaded-virtual
         },
       },
 
-      'Dart_Debug': {
-        'abstract': 1,
-        'defines': [
-          'DEBUG',
-        ],
-        'xcode_settings': {
-          'GCC_OPTIMIZATION_LEVEL': '<(dart_debug_optimization_level)',
-        },
-      },
-
-      'Debug': {
-        'defines': [
-          'DEBUG',
-        ],
-      },
-
       'Dart_ia32_Base': {
         'abstract': 1,
         'xcode_settings': {
           'ARCHS': [ 'i386' ],
         },
         'conditions': [
           ['OS=="linux" and dart_vtune_support==1', {
             'ldflags': ['-L<(dart_vtune_root)/lib32'],
           }],
           ['OS=="win" and dart_vtune_support==1', {
@@ skipping 46 matching lines @@
         },
       },
 
       'Dart_simmips_Base': {
         'abstract': 1,
         'xcode_settings': {
           'ARCHS': [ 'i386' ],
         },
       },
 
+      'Dart_Debug': {
+        'abstract': 1,
+        'defines': [
+          'DEBUG',
+        ],
+        'xcode_settings': {
+          'GCC_OPTIMIZATION_LEVEL': '<(dart_debug_optimization_level)',
+        },
+      },
+
+      'Debug': {
+        'defines': [
+          'DEBUG',
+        ],
+      },
+
       'Dart_Release': {
         'abstract': 1,
         'xcode_settings': {
           'GCC_OPTIMIZATION_LEVEL': '3',
         },
       },
+
+      'Dart_Product' : {
+        'abstract': 1,
+        'xcode_settings': {
+          'GCC_OPTIMIZATION_LEVEL': '3',
+        }
+      },
     },
   },
 }