Load the test page before measurement in PerfTestRunner.measurePageLoadTime()

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 275 matching lines @@
 
     function callRunAndMeasureTime(callsPerIteration) {
         var startTime = PerfTestRunner.now();
         for (var i = 0; i < callsPerIteration; i++)
             currentTest.run();
         return PerfTestRunner.now() - startTime;
     }
 
 
     PerfTestRunner.measurePageLoadTime = function(test) {
+        var file = PerfTestRunner.loadFile(test.path);
         test.run = function() {
-            var file = PerfTestRunner.loadFile(test.path);
             if (!test.chunkSize)
                 this.chunkSize = 50000;
 
             var chunks = [];
             // The smaller the chunks the more style resolves we do.
             // Smaller chunk sizes will show more samples in style resolution.
             // Larger chunk sizes will show more samples in line layout.
             // Smaller chunk sizes run slower overall, as the per-chunk overhead is high.
             var chunkCount = Math.ceil(file.length / this.chunkSize);
             for (var chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++) {
@@ skipping 18 matching lines @@
 
             iframe.contentDocument.close();
             document.body.removeChild(iframe);
         };
 
         PerfTestRunner.measureTime(test);
     }
 
     window.PerfTestRunner = PerfTestRunner;
 })();