Add serializers for window.performance.

third_party/WebKit/LayoutTests/fast/dom/Window/window-properties-performance.html

 <p>This test dumps all of the properties that are reachable from the window.performance object, along with their types.</p>
 <hr>
 <pre id="pre"></pre>
 
 <script>
 if (window.testRunner)
     testRunner.dumpAsText();
-    
+
 var logBuffer = [];
 function log(s)
 {
     logBuffer.push(s);
 }
 
 var pre = document.getElementById('pre');
 function flushLog()
 {
     var logMessage = logBuffer.join("");
@@ skipping 65 matching lines @@
     array.sort();
     for (var i = 0; i < array.length; i++) {
         var property = array[i];
         logValue(objectName + "." + property);
     }
 }
 
 logValue('window.performance');
 window.performance.timing = 'timing is not replaceable';
 logValue('window.performance.timing');
+
 // PerformanceTiming supports a serializer.
 var jsonizedTiming = JSON.parse(JSON.stringify(window.performance.timing));
 logValue('jsonizedTiming');
+
 // PerformanceEntry supports a serializer.
 window.performance.measure('request');
 var jsonizedEntry = JSON.parse(JSON.stringify(window.performance.getEntriesByName('request')[0]));
 logValue('jsonizedEntry');
+
 window.performance.navigation = 'navigation is not replaceable';
 logValue('window.performance.navigation');
+
+// PerformanceNavigation supports a serializer.
+var jsonizedNavigation = JSON.parse(JSON.stringify(window.performance.navigation));
+logValue('jsonizedNavigation');
+
+// Performance supports a serializer.
+var jsonizedPerformance = JSON.parse(JSON.stringify(window.performance));
+logValue('jsonizedPerformance');
+
 window.performance = 'performance is replaceable';
 logValue('window.performance');
+
 flushLog();
 </script>