Check in codegen test expectations.

test/codegen/expect/corelib/duration_double_multiplication_test.js

+dart_library.library('corelib/duration_double_multiplication_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__duration_double_multiplication_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 duration_double_multiplication_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  duration_double_multiplication_test.main = function() {
+    let d = null, d1 = null;
+    d1 = new core.Duration({milliseconds: 1});
+    d = d1['*'](0.005);
+    expect$.Expect.equals(1000 * 0.005, d.inMicroseconds);
+    d = d1['*'](0.0);
+    expect$.Expect.equals(0, d.inMicroseconds);
+    d = d1['*'](-0.005);
+    expect$.Expect.equals(1000 * -0.005, d.inMicroseconds);
+    d = d1['*'](0.0015);
+    expect$.Expect.equals((1000 * 0.0015)[dartx.round](), d.inMicroseconds);
+  };
+  dart.fn(duration_double_multiplication_test.main, VoidTodynamic());
+  // Exports:
+  exports.duration_double_multiplication_test = duration_double_multiplication_test;
+});