Add toStructuredText to ConstantExpression and align method names with ConstantValue

pkg/compiler/lib/src/compiler.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.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 1223 matching lines @@
   /// Associate [element] with a compile-time error [message].
   void registerCompiletimeError(Element element, DiagnosticMessage message) {
     // The information is only needed if [generateCodeWithCompileTimeErrors].
     if (options.generateCodeWithCompileTimeErrors) {
       if (element == null) {
         // Record as global error.
         // TODO(zarah): Extend element model to represent compile-time
         // errors instead of using a map.
         element = mainFunction;
       }
-      elementsWithCompileTimeErrors.
-          putIfAbsent(element, () => <DiagnosticMessage>[]).add(message);
+      elementsWithCompileTimeErrors
+          .putIfAbsent(element, () => <DiagnosticMessage>[])
+          .add(message);
     }
   }
 
   EventSink<String> outputProvider(String name, String extension) {
     if (compilationFailed) {
       if (!options.generateCodeWithCompileTimeErrors || options.testMode) {
         // Disable output in test mode: The build bot currently uses the time
         // stamp of the generated file to determine whether the output is
         // up-to-date.
         return new NullSink('$name.$extension');
@@ skipping 805 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }