Implementing timeout support for XHR

LayoutTests/http/tests/resources/load-and-stall.php

 <?php
 $name = $_GET['name'];
 $stallAt = $_GET['stallAt'];
 $stallFor = $_GET['stallFor'];
 $mimeType = $_GET['mimeType'];
 
 $file = fopen($name, "rb");
 if (!$file)
     die("Cannot open file.");
 
 header("Content-Type: " . $mimeType);
 header("Content-Length: " . filesize($name));
 
 if (isset($stallAt) && isset($stallFor)) {
     $stallAt = (int)$stallAt;
-    $stallFor = (int)$stallFor;
     if ($stallAt > filesize($name))
         die("Incorrect value for stallAt.");
     $written = 0;
     while ($written < $stallAt) {
         $write = 1024;
         if ($write > $stallAt - $written)
             $write = $stallAt - $written;
 
         echo(fread($file, $write));
         $written += $write;
         flush();
         ob_flush();
     }
     usleep($stallFor * 1000000);
     echo(fread($file, filesize($name) - $stallAt));
 } else {
     echo(fread($file, filesize($name)));
 }
 flush();
 ob_flush();
 fclose($file);
 ?>