Check in codegen test expectations.

test/codegen/expect/corelib/double_round3_test.js

Index: test/codegen/expect/corelib/double_round3_test.js
diff --git a/test/codegen/expect/corelib/double_round3_test.js b/test/codegen/expect/corelib/double_round3_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..b04e7bdb6cae40cbd4b637c8494e868c6cfcc0f8
--- /dev/null
+++ b/test/codegen/expect/corelib/double_round3_test.js
@@ -0,0 +1,21 @@
+dart_library.library('corelib/double_round3_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__double_round3_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const double_round3_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  double_round3_test.main = function() {
+    expect$.Expect.equals(0, 0.49999999999999994[dartx.round]());
+    expect$.Expect.equals(0, (-0.49999999999999994)[dartx.round]());
+    expect$.Expect.isTrue(typeof 0.49999999999999994[dartx.round]() == 'number');
+    expect$.Expect.isTrue(typeof (-0.49999999999999994)[dartx.round]() == 'number');
+  };
+  dart.fn(double_round3_test.main, VoidTodynamic());
+  // Exports:
+  exports.double_round3_test = double_round3_test;
+});