Add toStructuredText to ConstantExpression and align method names with ConstantValue

pkg/compiler/lib/src/io/start_end_information.dart

 // Copyright (c) 2015, 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.
 
 /// Source information system that maps spans of Dart AST nodes to spans of
 /// JavaScript nodes.
 
 library dart2js.source_information.start_end;
 
 import '../common.dart';
 import '../diagnostics/messages.dart' show MessageTemplate;
-import '../elements/elements.dart' show AstElement, ResolvedAst, ResolvedAstKind;
+import '../elements/elements.dart'
+    show AstElement, ResolvedAst, ResolvedAstKind;
 import '../js/js.dart' as js;
 import '../js/js_source_mapping.dart';
 import '../tokens/token.dart' show Token;
 import '../tree/tree.dart' show Node;
 import 'source_file.dart';
 import 'source_information.dart';
 
 /// Source information that contains start source position and optionally an
 /// end source position.
 class StartEndSourceInformation extends SourceInformation {
@@ skipping 50 matching lines @@
       AstElement implementation = resolvedAst.element.implementation;
       sourceFile = implementation.compilationUnit.script.file;
       Node node = resolvedAst.node;
       begin = node.getBeginToken().charOffset;
       end = node.getEndToken().charOffset;
     }
     // TODO(johnniwinther): find the right sourceFile here and remove offset
     // checks below.
     SourceLocation sourcePosition, endSourcePosition;
     if (begin < sourceFile.length) {
-      sourcePosition =
-          new OffsetSourceLocation(sourceFile, begin, name);
+      sourcePosition = new OffsetSourceLocation(sourceFile, begin, name);
     }
     if (end < sourceFile.length) {
       endSourcePosition = new OffsetSourceLocation(sourceFile, end, name);
     }
     return new StartEndSourceInformation(sourcePosition, endSourcePosition);
   }
 
   /// Create a textual representation of the source information using [uriText]
   /// as the Uri representation.
   String _computeText(String uriText) {
@@ skipping 122 matching lines @@
 
   @override
   SourceInformation buildIf(Node node) => buildGeneric(node);
 
   @override
   SourceInformationBuilder forContext(AstElement element,
       {SourceInformation sourceInformation}) {
     return new StartEndSourceInformationBuilder(element);
   }
 }