dart2js: add compiler builtins to the core-runtime.

pkg/compiler/lib/src/js_backend/backend.dart

 // 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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 const bool USE_CPS_IR = const bool.fromEnvironment("USE_CPS_IR");
 
@@ skipping 492 matching lines @@
   /// Holds the method "preserveLibraryNames" in js_mirrors when
   /// dart:mirrors has been loaded.
   FunctionElement preserveLibraryNamesMarker;
 
   /// Holds the method "requiresPreamble" in _js_helper.
   FunctionElement requiresPreambleMarker;
 
   /// Holds the class for the [JsGetName] enum.
   EnumClassElement jsGetNameEnum;
 
+  /// Holds the class for the [JsBuiltins] enum.
+  EnumClassElement jsBuiltinEnum;
+
   /// True if a call to preserveMetadataMarker has been seen.  This means that
   /// metadata must be retained for dart:mirrors to work correctly.
   bool mustRetainMetadata = false;
 
   /// True if any metadata has been retained.  This is slightly different from
   /// [mustRetainMetadata] and tells us if any metadata was retained.  For
   /// example, if [mustRetainMetadata] is true but there is no metadata in the
   /// program, this variable will stil be false.
   bool hasRetainedMetadata = false;
 
@@ skipping 1489 matching lines @@
         requiresPreambleMarker = findMethod('requiresPreamble');
       } else if (uri == DART_JS_MIRRORS) {
         disableTreeShakingMarker = find(library, 'disableTreeShaking');
         preserveMetadataMarker = find(library, 'preserveMetadata');
         preserveUrisMarker = find(library, 'preserveUris');
         preserveLibraryNamesMarker = find(library, 'preserveLibraryNames');
       } else if (uri == DART_JS_NAMES) {
         preserveNamesMarker = find(library, 'preserveNames');
       } else if (uri == DART_EMBEDDED_NAMES) {
         jsGetNameEnum = find(library, 'JsGetName');
+        jsBuiltinEnum = find(library, 'JsBuiltin');
       } else if (uri == DART_HTML) {
         htmlLibraryIsLoaded = true;
       }
       annotations.onLibraryScanned(library);
     });
   }
 
   Future onLibrariesLoaded(LoadedLibraries loadedLibraries) {
     if (!loadedLibraries.containsLibrary(Compiler.DART_CORE)) {
       return new Future.value();
@@ skipping 837 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }