Split scannerlib.dart into several libraries.

pkg/compiler/lib/src/native/native.dart

Index: pkg/compiler/lib/src/native/native.dart
diff --git a/pkg/compiler/lib/src/native/native.dart b/pkg/compiler/lib/src/native/native.dart
index 281009d834cb3bca118f36190ae3f1a8a6796390..e5623c22b620dc0c47885f2345647c66ce9dd260 100644
--- a/pkg/compiler/lib/src/native/native.dart
+++ b/pkg/compiler/lib/src/native/native.dart
@@ -13,7 +13,8 @@ import '../compiler.dart' show
 import '../constants/values.dart';
 import '../dart_types.dart';
 import '../diagnostics/diagnostic_listener.dart';
-import '../diagnostics/messages.dart' show MessageKind;
+import '../diagnostics/messages.dart' show
+    MessageKind;
 import '../diagnostics/spannable.dart' show
     NO_LOCATION_SPANNABLE,
     Spannable;
@@ -28,9 +29,20 @@ import '../elements/modelx.dart' show
     LibraryElementX;
 import '../js/js.dart' as js;
 import '../js_backend/js_backend.dart';
-import '../js_emitter/js_emitter.dart' show CodeEmitterTask, NativeEmitter;
-import '../resolution/members.dart' show ResolverVisitor;
-import '../scanner/scannerlib.dart';
+import '../js_emitter/js_emitter.dart' show
+    CodeEmitterTask,
+    NativeEmitter;
+import '../resolution/members.dart' show
+    ResolverVisitor;
+import '../scanner/listener.dart' show
+    ElementListener,
+    Listener,
+    PartialMetadataAnnotation;
+import '../scanner/token.dart' show
+    BeginGroupToken,
+    EOF_TOKEN,
+    STRING_TOKEN,
+    Token;
 import '../ssa/ssa.dart';
 import '../tree/tree.dart';
 import '../universe/universe.dart' show SideEffects;