Enable blink_perf.canvas on Android Perf bots

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 115 matching lines @@
     }
 
     PerfTestRunner.log = function (text) {
         if (logLines)
             logLines.push(text);
         else
             logInDocument(text);
     }
 
     PerfTestRunner.logFatalError = function (text) {
-        PerfTestRunner.log(text);
+        PerfTestRunner.log("FATAL: " + text);
         finish();
     }
 
     PerfTestRunner.forceLayout = function(doc) {
         doc = doc || document;
         if (doc.body)
             doc.body.offsetHeight;
         else if (doc.documentElement)
             doc.documentElement.offsetHeight;
     };
@@ skipping 179 matching lines @@
 
             iframe.contentDocument.close();
             document.body.removeChild(iframe);
         };
 
         PerfTestRunner.measureTime(test);
     }
 
     window.PerfTestRunner = PerfTestRunner;
 })();