Move parser and token related libraries into their own subfolder.

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

Index: pkg/compiler/lib/src/parser/parser_task.dart
diff --git a/pkg/compiler/lib/src/scanner/parser_task.dart b/pkg/compiler/lib/src/parser/parser_task.dart
similarity index 97%
rename from pkg/compiler/lib/src/scanner/parser_task.dart
rename to pkg/compiler/lib/src/parser/parser_task.dart
index 6e0ea4cd61f1ef6867903bf98f655fc666c5f742..b8f85ffcd8b1235ad38965146383069c809868a2 100644
--- a/pkg/compiler/lib/src/scanner/parser_task.dart
+++ b/pkg/compiler/lib/src/parser/parser_task.dart
@@ -12,6 +12,8 @@ import '../diagnostics/invariant.dart' show
     invariant;
 import '../elements/modelx.dart' show
     ElementX;
+import '../tokens/token.dart' show
+    Token;
 import '../tree/tree.dart' show
     Node;
 
@@ -20,8 +22,6 @@ import 'listener.dart' show
     ParserError;
 import 'parser.dart' show
     Parser;
-import 'token.dart' show
-    Token;
 
 class ParserTask extends CompilerTask {
   ParserTask(Compiler compiler) : super(compiler);