[inspector] console.timeEnd formats ms in the same way as JS formats double

test/inspector/runtime/console-time-end-format.js

Index: test/inspector/runtime/console-time-end-format.js
diff --git a/test/inspector/runtime/console-time-end-format.js b/test/inspector/runtime/console-time-end-format.js
new file mode 100644
index 0000000000000000000000000000000000000000..77e7b55831e5f9a991ca5ba38e18bbdd6d17a79c
--- /dev/null
+++ b/test/inspector/runtime/console-time-end-format.js
@@ -0,0 +1,45 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+print('Checks format of console.timeEnd output');
+
+Protocol.Runtime.enable();
+Protocol.Runtime.onConsoleAPICalled(message => {
+  InspectorTest.log(message.params.args[0].value);
+});
+
+InspectorTest.runTestSuite([
+  function zero(next) {
+    checkInterval(0.0).then(next);
+  },
+  function verySmall(next) {
+    checkInterval(1e-15).then(next);
+  },
+  function small(next) {
+    checkInterval(0.001).then(next);
+  },
+  function regular(next) {
+    checkInterval(1.2345).then(next);
+  },
+  function big(next) {
+    checkInterval(10000.2345).then(next);
+  },
+  function veryBig(next) {
+    checkInterval(1e+15 + 0.2345).then(next);
+  },
+  function huge(next) {
+    checkInterval(1e+42).then(next);
+  }
+]);
+
+function checkInterval(time) {
+  setCurrentTimeMSForTest(0.0);
+  return Protocol.Runtime.evaluate({
+    expression: `console.log('js: ' + ${time} + 'ms')`})
+    .then(() => Protocol.Runtime.evaluate({
+      expression: 'console.time(\'timeEnd\')'}))
+    .then(() => setCurrentTimeMSForTest(time))
+    .then(() => Protocol.Runtime.evaluate({
+      expression: 'console.timeEnd(\'timeEnd\')'}));
+}