dart2js: emit metadata in new emitter.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
index 250a85ee00d1d6333cf748570cc8d9914201d61d..d7613110e78a1a74e98a2bcd452b02112c4483e4 100644
--- a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
@@ -19,6 +19,7 @@ import 'package:_internal/compiler/js_lib/shared/embedded_names.dart' show
     IS_HUNK_INITIALIZED,
     IS_HUNK_LOADED,
     MANGLED_GLOBAL_NAMES,
+    METADATA,
     TYPE_TO_INTERCEPTOR_MAP;
 
 import '../js_emitter.dart' show NativeGenerator;
@@ -171,6 +172,8 @@ class ModelEmitter {
 
     globals.add(emitGetTypeFromName());
 
+    globals.add(emitMetadata(program));
+
     js.ObjectInitializer globalsObject = new js.ObjectInitializer(globals);
 
     List<js.Statement> statements =
@@ -240,6 +243,14 @@ class ModelEmitter {
     return new js.Property(js.string(GET_TYPE_FROM_NAME), function);
   }
 
+  js.Property emitMetadata(Program program) {
+    String metadataList = "[${program.metadata.join(",")}]";
+    js.Expression metadata =
+        js.js.uncachedExpressionTemplate(metadataList).instantiate([]);
+
+    return new js.Property(js.string(METADATA), metadata);
+  }
+
   js.Expression emitDeferredFragment(DeferredFragment fragment,
                                      List<Holder> holders) {
     // TODO(floitsch): initialize eager classes.