Compute frontend/backend specific constants.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.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.
 
 library dart2js.mirrors;
 
 import 'dart:collection' show UnmodifiableListView;
 
 import '../elements/elements.dart';
 import '../scanner/scannerlib.dart';
@@ skipping 212 matching lines @@
     }
   }
 
   List<InstanceMirror> get metadata {
     if (_metadata == null) {
       _metadata = <InstanceMirror>[];
       for (MetadataAnnotation metadata in _element.metadata) {
         _appendCommentTokens(
             mirrorSystem.compiler.commentMap[metadata.beginToken]);
         metadata.ensureResolved(mirrorSystem.compiler);
-        _metadata.add(
-            _convertConstantToInstanceMirror(mirrorSystem, metadata.value));
+        _metadata.add(_convertConstantToInstanceMirror(mirrorSystem,
+                                                       metadata.value));
       }
       _appendCommentTokens(mirrorSystem.compiler.commentMap[getBeginToken()]);
     }
     // TODO(johnniwinther): Return an unmodifiable list instead.
     return new List<InstanceMirror>.from(_metadata);
   }
 
   DeclarationMirror lookupInScope(String name) {
     // TODO(11653): Support lookup of constructors.
     Scope scope = _element.buildScope();
@@ skipping 213 matching lines @@
  *
  * All API in this class is experimental.
  */
 class BackDoor {
   /// Return the compilation units comprising [library].
   static List<Mirror> compilationUnitsOf(Dart2JsLibraryMirror library) {
     return library._element.compilationUnits.toList().map(
         (cu) => new Dart2JsCompilationUnitMirror(cu, library)).toList();
   }
 }