Add typedef AST node boilerplate.

pkg/kernel/lib/binary/ast_to_binary.dart

Index: pkg/kernel/lib/binary/ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_to_binary.dart b/pkg/kernel/lib/binary/ast_to_binary.dart
index f2e47e03bc13d7c89e7494d9fc9413c94323b278..def8885a42ee5a655427657b47430220e508ab12 100644
--- a/pkg/kernel/lib/binary/ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/ast_to_binary.dart
@@ -251,6 +251,7 @@ class BinaryPrinter extends Visitor {
     // TODO(jensj): We save (almost) the same URI twice.
     writeUriReference(node.fileUri ?? '');
     writeDeferredImports(node);
+    writeNodeList(node.typedefs);
     writeNodeList(node.classes);
     writeNodeList(node.fields);
     writeNodeList(node.procedures);
@@ -273,6 +274,15 @@ class BinaryPrinter extends Visitor {
     writeStringReference(node.name);
   }
 
+  void visitTypedef(Typedef node) {
+    writeCanonicalNameReference(getCanonicalNameOfTypedef(node));
+    writeOffset(node.fileOffset);
+    writeStringReference(node.name);
+    writeUriReference(node.fileUri ?? '');
+    writeNodeList(node.typeParameters);
+    writeNode(node.type);
+  }
+
   void writeAnnotation(Expression annotation) {
     _variableIndexer ??= new VariableIndexer();
     writeNode(annotation);
@@ -1009,6 +1019,12 @@ class BinaryPrinter extends Visitor {
     writeByte(Tag.VectorType);
   }
 
+  visitTypedefType(TypedefType node) {
+    writeByte(Tag.TypedefType);
+    writeReference(node.typedefReference);
+    writeNodeList(node.typeArguments);
+  }
+
   visitTypeParameter(TypeParameter node) {
     writeStringReference(node.name ?? '');
     writeNode(node.bound);