Check in codegen test expectations.

test/codegen/expect/corelib/duration_big_num_test.js

Index: test/codegen/expect/corelib/duration_big_num_test.js
diff --git a/test/codegen/expect/corelib/duration_big_num_test.js b/test/codegen/expect/corelib/duration_big_num_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..5df5ea9cae7683d48879ff97106d9526d954ea5e
--- /dev/null
+++ b/test/codegen/expect/corelib/duration_big_num_test.js
@@ -0,0 +1,27 @@
+dart_library.library('corelib/duration_big_num_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__duration_big_num_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const math = dart_sdk.math;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const duration_big_num_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  duration_big_num_test.main = function() {
+    let d = null, d1 = null;
+    d1 = new core.Duration({microseconds: dart.asInt(math.pow(2, 53))});
+    d = d1['*'](2);
+    expect$.Expect.equals(math.pow(2, 54), d.inMicroseconds);
+    d = d1['*'](1.5);
+    expect$.Expect.equals(dart.notNull(math.pow(2, 53)[dartx.toDouble]()) * 1.5, d.inMicroseconds);
+    expect$.Expect.isTrue(typeof d.inMicroseconds == 'number');
+    d = new core.Duration({microseconds: dart.asInt(dart.notNull(math.pow(2, 53)) + 1)})['*'](1.0);
+    expect$.Expect.equals(0, d.inMicroseconds[dartx['%']](2));
+  };
+  dart.fn(duration_big_num_test.main, VoidTodynamic());
+  // Exports:
+  exports.duration_big_num_test = duration_big_num_test;
+});