The Tor Browser / file revision

 importScripts('utils_bug743615.js');

 self.onmessage = function onMessage(evt) {

   // Check the pattern that was sent.

   var imageData = evt.data.imageData;

   var pattern = evt.data.pattern;

   var statusMessage = checkPattern(imageData, pattern)

                        ? 'PASS' : 'Got corrupt typed array in worker';

   // Check against the interface object.

   if (!(imageData instanceof ImageData))

     statusMessage += ", Bad interface object in worker";

   // Check the getters.

   if (imageData.width * imageData.height != imageData.data.length / 4) {

     statusMessage += ", Bad ImageData getters in worker: "

     statusMessage += [imageData.width, imageData.height].join(', ');

   }

   // Make sure that writing to .data is a no-op when not in strict mode.

   var origData = imageData.data;

   var threw = false;

   try {

     imageData.data = [];

     imageData.width = 2;

     imageData.height = 2;

   } catch(e) { threw = true; }

   if (threw || imageData.data !== origData)

     statusMessage = statusMessage + ", Should silently ignore sets";

   // Send back a new pattern.

   pattern = makePattern(imageData.data.length, 99, 2);

   setPattern(imageData, pattern);

   self.postMessage({ statusMessage: statusMessage, imageData: imageData,

                      pattern: pattern });

 }