Bug 627015 - Add a crashtest for an image that takes a very long time to download the next frame, giving our animation timer a chance to fire. r=jrmuizel

modules/libpr0n/test/crashtests/crashtests.list

@@ -22,3 +22,7 @@ load 256-height.ico
 # GIFs with LZW data that isn't terminated properly.
 load invalid-lzw-end1.gif
 load invalid-lzw-end2.gif
+
+# A 3-frame animated GIF with an inordinate delay between the second and third
+# frame.
+HTTP load delayedframe.sjs

modules/libpr0n/test/crashtests/delayedframe.sjs

@@ -0,0 +1,42 @@
+function getFileStream(filename)
+{
+  // Get the location of this sjs file, and then use that to figure out where
+  // to find where our other files are.
+  var self = Components.classes["@mozilla.org/file/local;1"]
+                       .createInstance(Components.interfaces.nsILocalFile);
+  self.initWithPath(getState("__LOCATION__"));
+  var file = self.parent;
+  file.append(filename);
+  dump(file.path + "\n");
+
+  var fileStream = Components.classes['@mozilla.org/network/file-input-stream;1']
+                     .createInstance(Components.interfaces.nsIFileInputStream);
+  fileStream.init(file, 1, 0, false);
+
+  return fileStream;
+}
+
+function handleRequest(request, response)
+{
+  response.processAsync();
+  response.setStatusLine(request.httpVersion, 200, "OK");
+  response.setHeader("Content-Type", "image/gif", false);
+
+  var firststream = getFileStream("threeframes-start.gif");
+  response.bodyOutputStream.writeFrom(firststream, firststream.available())
+  firststream.close();
+
+  var timer = Components.classes["@mozilla.org/timer;1"].createInstance(Components.interfaces.nsITimer);
+  timer.initWithCallback(function()
+  {
+    var secondstream = getFileStream("threeframes-end.gif");
+    response.bodyOutputStream.writeFrom(secondstream, secondstream.available())
+    secondstream.close();
+    response.finish();
+
+    // This time needs to be longer than the animation timer in
+    // threeframes-start.gif. That's specified as 100ms; just use 5 seconds as
+    // a reasonable upper bound. Since this is just a crashtest, timeouts
+    // aren't a big deal.
+  }, 5 * 1000 /* milliseconds */, Components.interfaces.nsITimer.TYPE_ONE_SHOT);
+}