[Binding][Performance]Add a new performance benchmark for postMessge

third_party/WebKit/PerformanceTests/Bindings/post-message.html

Index: third_party/WebKit/PerformanceTests/Bindings/post-message.html
diff --git a/third_party/WebKit/PerformanceTests/Bindings/serialize-long-string.html b/third_party/WebKit/PerformanceTests/Bindings/post-message.html
similarity index 58%
copy from third_party/WebKit/PerformanceTests/Bindings/serialize-long-string.html
copy to third_party/WebKit/PerformanceTests/Bindings/post-message.html
index 6018a386f172dde3195c900d17390f975eb7a13e..862aa8249a2417c7cb887b212378593d5bac1c57 100644
--- a/third_party/WebKit/PerformanceTests/Bindings/serialize-long-string.html
+++ b/third_party/WebKit/PerformanceTests/Bindings/post-message.html
@@ -3,19 +3,17 @@
 <script src="../resources/runner.js"></script>
 <script>
 
-var log2Length = 23;
-var str = "a";
-for (var i = 0; i < log2Length; i++)
-    str = str + str;
+var times = 100000;
 var worker = new Worker('resources/worker.js');
 worker.onmessage = function(event) {
     console.log("received");
 };
 
 PerfTestRunner.measureTime({
-    description: "Measures performance of serializing a long string.",
+    description: "Measures performance of postMessage().",
     run: function() {
-        worker.postMessage(str);
+        for (var i = 0; i < times; i++)
+            worker.postMessage('foo');
     }
 });
 </script>