Enable ServerTiming support

third_party/WebKit/LayoutTests/external/wpt/server-timing/resources/webperftestharness.js

+/*
+Distributed under both the W3C Test Suite License [1] and the W3C
+3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
+policies and contribution forms [3].
+
+[1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
+[2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
+[3] http://www.w3.org/2004/10/27-testcases
+ */
+
+var namespace_check = false
+function wp_test(func, msg, properties) {
+  if (!namespace_check) {
+    namespace_check = true
+    var performanceNamespace = window.performance
+    if (performanceNamespace === undefined || performanceNamespace == null) {
+      // show a single error that window.performance is undefined
+      test(function () {
+        assert_true(performanceNamespace !== undefined && performanceNamespace != null, "window.performance is defined and not null")
+      }, "window.performance is defined and not null.", {
+        author: "W3C http://www.w3.org/",
+        help: "http://www.w3.org/TR/navigation-timing/#sec-window.performance-attribute",
+        assert: "The window.performance attribute provides a hosting area for performance related attributes. "
+      })
+    }
+  }
+
+  test(func, msg, properties)
+}
+
+function test_true(value, msg, properties) {
+  wp_test(function () {
+    assert_true(value, msg)
+  }, msg, properties)
+}
+
+function test_equals(value, equals, msg, properties) {
+  wp_test(function () {
+    assert_equals(value, equals, msg)
+  }, msg, properties)
+}
+
+// assert for every entry in `expectedEntries`, there is a matching entry _somewhere_ in `actualEntries`
+function test_entries(actualEntries, expectedEntries) {
+  test_equals(actualEntries.length, expectedEntries.length)
+  expectedEntries.forEach(function (expectedEntry) {
+    test_true(!!actualEntries.find(function (actualEntry) {
+      return typeof Object.keys(expectedEntry).find(function (key) {
+            return actualEntry[key] !== expectedEntry[key]
+          }) === 'undefined'
+    }))
+  })
+}