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

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

Index: sdk/lib/_internal/compiler/implementation/tree/unparser.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
index 69c537530a28c17a1d8aa2e97dbde947165d550a..4a0e6e74903cba6791ec3fde71abea2db436a650 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
@@ -81,6 +81,27 @@ class Unparser implements Visitor {
     unparseClassWithBody(node, node.body.nodes);
   }
 
+  visitMixinApplication(MixinApplication node) {
+    if (!node.modifiers.nodes.isEmpty) {
+      visit(node.modifiers);
+      sb.add(' ');
+    }
+    visit(node.superclass);
+    sb.add(' with ');
+    visit(node.mixins);
+  }
+
+  visitNamedMixinApplication(NamedMixinApplication node) {
+    sb.add('typedef ');
+    visit(node.name);
+    if (node.typeParameters != null) {
+      visit(node.typeParameters);
+    }
+    sb.add(' = ');
+    visit(node.mixinApplication);
+    sb.add(';');
+  }
+
   visitConditional(Conditional node) {
     visit(node.condition);
     add(node.questionToken.value);