Move parser and token related libraries into their own subfolder.

site/try/poi/poi.dart

 // Copyright (c) 2014, 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 trydart.poi;
 
 import 'dart:async' show
     Completer,
     Future;
 
@@ skipping 42 matching lines @@
 import 'package:compiler/src/elements/modelx.dart' show
     DeclarationSite;
 
 import 'package:compiler/src/enqueue.dart' show
     Enqueuer,
     QueueFilter;
 
 import 'package:compiler/src/dart_types.dart' show
     DartType;
 
-import 'package:compiler/src/scanner/class_element_parser.dart' show
+import 'package:compiler/src/parser/class_element_parser.dart' show
     PartialClassElement;
 
-import 'package:compiler/src/scanner/listener.dart' show
+import 'package:compiler/src/parser/listener.dart' show
     PartialElement;
 
-import 'package:compiler/src/scanner/token.dart' show
+import 'package:compiler/src/tokens/token.dart' show
     EOF_TOKEN,
     IDENTIFIER_TOKEN,
     KEYWORD_TOKEN,
     Token;
 
 import 'package:compiler/src/js/js.dart' show
     js;
 
 import 'scope_information_visitor.dart' show
     ScopeInformationVisitor;
@@ skipping 483 matching lines @@
     f(work);
     printWallClock('Processed ${work.element}.');
   }
 }
 
 class PoiTask extends CompilerTask {
   PoiTask(Compiler compiler) : super(compiler);
 
   String get name => 'POI';
 }