Add build rules for dart2js.

dart/utils/compiler/compiler.gyp

Index: dart/utils/compiler/compiler.gyp
diff --git a/dart/utils/compiler/compiler.gyp b/dart/utils/compiler/compiler.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..ecccdaf9cd57873e38b226a97f948a50993adff7
--- /dev/null
+++ b/dart/utils/compiler/compiler.gyp
@@ -0,0 +1,36 @@
+# 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'dart2js',
+      'type': 'none',
+      'dependencies': [
+        '../../runtime/dart-runtime.gyp:dart',
+      ],
+      'actions': [
+        {
+          'action_name': 'build_dart2js',
+          'inputs': [
+            '<(PRODUCT_DIR)/dart',
+            'build_helper.dart',
+          ],
+          'outputs': [
+            '<(PRODUCT_DIR)/dart2js',
+            '<(PRODUCT_DIR)/dart2js_developer',
+          ],
+          'action': [
+            '<(PRODUCT_DIR)/dart',
+            'build_helper.dart',
+            '<(PRODUCT_DIR)',
+            'dart',
+            'dart2js',
+            'dart2js_developer',
+          ],
+        },
+      ],
+    },
+  ],
+}