Serialize parameter nodes for local functions.

pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart

Index: pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
diff --git a/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart b/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
index b5d6caee9de3b3ed6d883e066022522185bb1103..bce66ac01bd93fbfaa0004d59c4b5b24975dd6d0 100644
--- a/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
+++ b/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
@@ -166,21 +166,25 @@ class ResolvedAstSerializer extends Visitor {
         serializeLabelDefinition(labelDefinition, list.createObject());
       }
     }
+
     if (element is FunctionElement) {
-      FunctionElement function = element;
-      function.functionSignature.forEachParameter((ParameterElement parameter) {
-        ParameterElement parameterImpl = parameter.implementation;
-        // TODO(johnniwinther): Should we support element->node mapping as well?
-        getNodeDataEncoder(parameterImpl.node)
-            .setElement(PARAMETER_NODE, parameter);
-        if (parameter.initializer != null) {
-          getNodeDataEncoder(parameterImpl.initializer)
-              .setElement(PARAMETER_INITIALIZER, parameter);
-        }
-      });
+      serializeParameterNodes(element);
     }
   }
 
+  void serializeParameterNodes(FunctionElement function) {
+    function.functionSignature.forEachParameter((ParameterElement parameter) {
+      ParameterElement parameterImpl = parameter.implementation;
+      // TODO(johnniwinther): Should we support element->node mapping as well?
+      getNodeDataEncoder(parameterImpl.node)
+          .setElement(PARAMETER_NODE, parameter);
+      if (parameter.initializer != null) {
+        getNodeDataEncoder(parameterImpl.initializer)
+            .setElement(PARAMETER_INITIALIZER, parameter);
+      }
+    });
+  }
+
   /// Serialize [target] into [encoder].
   void serializeJumpTarget(JumpTarget jumpTarget, ObjectEncoder encoder) {
     encoder.setElement(Key.EXECUTABLE_CONTEXT, jumpTarget.executableContext);
@@ -318,6 +322,7 @@ class ResolvedAstSerializer extends Visitor {
     if (function != null && function.isFunction && function.isLocal) {
       // Mark root nodes of local functions; these need their own ResolvedAst.
       getNodeDataEncoder(node).setElement(Key.FUNCTION, function);
+      serializeParameterNodes(function);
     }
   }
 }