1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/server/tests/chrome/inspector-delay-image-response.sjs b/devtools/server/tests/chrome/inspector-delay-image-response.sjs
new file mode 100644
index 0000000000..633d7e3aa6
--- /dev/null
+++ b/devtools/server/tests/chrome/inspector-delay-image-response.sjs
@@ -0,0 +1,46 @@
+/**
+ * Adapted from https://searchfox.org/mozilla-central/source/layout/reftests/backgrounds/delay-image-response.sjs
+ */
+"use strict";
+
+// A 1x1 PNG image.
+// Source: https://commons.wikimedia.org/wiki/File:1x1.png (Public Domain)
+const IMAGE = atob(
+  "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAA" +
+    "ACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII="
+);
+
+// To avoid GC.
+let timer = null;
+
+function handleRequest(request, response) {
+  const query = {};
+  request.queryString.split("&").forEach(function (val) {
+    const [name, value] = val.split("=");
+    query[name] = unescape(value);
+  });
+
+  response.setStatusLine(request.httpVersion, 200, "OK");
+  response.setHeader("Content-Type", "image/png", false);
+
+  // If there is no delay, we write the image and leave.
+  if (!("delay" in query)) {
+    response.write(IMAGE);
+    return;
+  }
+
+  // If there is a delay, we create a timer which, when it fires, will write
+  // image and leave.
+  response.processAsync();
+  const nsITimer = Ci.nsITimer;
+
+  timer = Cc["@mozilla.org/timer;1"].createInstance(nsITimer);
+  timer.initWithCallback(
+    function () {
+      response.write(IMAGE);
+      response.finish();
+    },
+    query.delay,
+    nsITimer.TYPE_ONE_SHOT
+  );
+}