Start adding support for mixin application syntax. We now parse the typedef variant of mixin applic…

sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart

Index: sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart b/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
index 683ab5ae6aada99f224b97bc0519e60a468df2b5..9eeb5cf9a82384284eeb03dfd684a8b5c2f3001d 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
@@ -263,6 +263,10 @@ class PrettyPrinter implements Visitor {
         {"value" : node.token.slowToString()});
   }
 
+  visitMixinApplication(MixinApplication node) {
+    visitNodeWithChildren(node, "MixinApplication");
+  }
+
   visitModifiers(Modifiers node) {
     visitNodeWithChildren(node, "Modifiers");
   }