perf test: Add PerfTestRunner.logFatalError(text)

PerformanceTests/resources/runner.js

 // There are tests for computeStatistics() located in LayoutTests/fast/harness/perftests
 
 // We need access to console.memory for the memory measurements
 if (window.internals)
     internals.settings.setMemoryInfoEnabled(true);
 
 if (window.testRunner) {
     testRunner.waitUntilDone();
     testRunner.dumpAsText();
 }
@@ skipping 124 matching lines @@
         window.scrollTo(0, document.body.height);
     }
 
     PerfTestRunner.log = function (text) {
         if (logLines)
             logLines.push(text);
         else
             logInDocument(text);
     }
 
+    PerfTestRunner.logFatalError(text) {
+        logFatalError(text);
+    }
+
     function logFatalError(text) {
         PerfTestRunner.log(text);
         finish();
     }
 
     function start(test, runner) {
         if (!test) {
             logFatalError("Got a bad test object.");
             return;
         }
@@ skipping 178 matching lines @@
 
             iframe.contentDocument.close();
             document.body.removeChild(iframe);
         };
 
         PerfTestRunner.measureTime(test);
     }
 
     window.PerfTestRunner = PerfTestRunner;
 })();