Split scannerlib.dart into several libraries.

pkg/compiler/lib/src/scanner/parser_task.dart

Index: pkg/compiler/lib/src/scanner/parser_task.dart
diff --git a/pkg/compiler/lib/src/scanner/parser_task.dart b/pkg/compiler/lib/src/scanner/parser_task.dart
index c680a31afb216f4c300362f331295e36805aa861..6e0ea4cd61f1ef6867903bf98f655fc666c5f742 100644
--- a/pkg/compiler/lib/src/scanner/parser_task.dart
+++ b/pkg/compiler/lib/src/scanner/parser_task.dart
@@ -2,7 +2,26 @@
 // 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 scanner;
+library dart2js.parser.task;
+
+import '../common/tasks.dart' show
+    CompilerTask;
+import '../compiler.dart' show
+    Compiler;
+import '../diagnostics/invariant.dart' show
+    invariant;
+import '../elements/modelx.dart' show
+    ElementX;
+import '../tree/tree.dart' show
+    Node;
+
+import 'listener.dart' show
+    NodeListener,
+    ParserError;
+import 'parser.dart' show
+    Parser;
+import 'token.dart' show
+    Token;
 
 class ParserTask extends CompilerTask {
   ParserTask(Compiler compiler) : super(compiler);