Move trace event emitting calls to outside of test run time measurement

third_party/WebKit/PerformanceTests/resources/runner.js

 // There are tests for computeStatistics() located in LayoutTests/fast/harness/perftests
 
 if (window.testRunner) {
     testRunner.waitUntilDone();
     testRunner.dumpAsText();
 }
 
 (function () {
     var logLines = null;
     var completedIterations = -1;
@@ skipping 340 matching lines @@
     }
 
     function zeroTimeoutScheduler(task) {
         setTimeout(task, 0);
     }
 
     function measureTimeOnce() {
         // Force gc before measuring time to avoid interference between tests.
         PerfTestRunner.gc();
 
+        addRunTestStartMarker();
         var start = PerfTestRunner.now();
-        addRunTestStartMarker();
         var returnValue = currentTest.run();
+        var end = PerfTestRunner.now();
         addRunTestEndMarker();
-        var end = PerfTestRunner.now();
 
         if (returnValue - 0 === returnValue) {
             if (returnValue < 0)
                 PerfTestRunner.log("runFunction returned a negative value: " + returnValue);
             return returnValue;
         }
 
         return end - start;
     }
 
@@ skipping 62 matching lines @@
 
             iframe.contentDocument.close();
             document.body.removeChild(iframe);
         };
 
         PerfTestRunner.measureTime(test);
     }
 
     window.PerfTestRunner = PerfTestRunner;
 })();