dart2js send stats, includes:

pkg/compiler/lib/src/stats/naive_analysis_result.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// API to get results from a static analysis of the source program.
+// TODO(sigmund): split out implementations out of this file.
+library compiler.src.stats.naive_analysis_result;
+
+import 'analysis_result.dart';
+import '../tree/tree.dart' show Node;
+import '../universe/selector.dart' show Selector;
+
+/// A naive [AnalysisResult] that tells us very little. This is the most
+/// conservative we can be when we only use information from the AST structure
+/// and from resolution, but no type information.
+class NaiveAnalysisResult implements AnalysisResult {
+  NaiveAnalysisResult();
+
+  ReceiverInfo infoForReceiver(Node receiver) =>
+    new NaiveReceiverInfo(receiver);
+  SelectorInfo infoForSelector(Node receiver, Selector selector) =>
+    new NaiveSelectorInfo(receiver, selector);
+}
+
+class NaiveReceiverInfo implements ReceiverInfo {
+  final Node receiver;
+
+  NaiveReceiverInfo(this.receiver);
+  Boolish get hasNoSuchMethod => Boolish.maybe;
+  Boolish get isNull => Boolish.maybe;
+  int get possibleNsmTargets => -1;
+}
+
+class NaiveSelectorInfo implements SelectorInfo {
+  final Node receiver;
+  final Selector selector;
+
+  NaiveSelectorInfo(this.receiver, this.selector);
+
+  Boolish get exists => Boolish.maybe;
+  Boolish get usesInterceptor => Boolish.maybe;
+  int get possibleTargets => -1;
+  bool get isAccurate => false;
+}