1 files changed, 11 insertions, 0 deletions
diff --git a/layout/base/tests/chrome/printpreview_images_sw.js b/layout/base/tests/chrome/printpreview_images_sw.js
new file mode 100644
index 0000000000..bb0ab60b1f
--- /dev/null
+++ b/layout/base/tests/chrome/printpreview_images_sw.js
@@ -0,0 +1,11 @@
+self.addEventListener("fetch", event => {
+  if (event.request.url.includes("nonexistent.png")) {
+    event.respondWith(
+      fetch(event.request.url.replace("nonexistent.png", "blue-32x32.png"))
+    );
+  }
+});
+
+self.addEventListener("activate", event => {
+  event.waitUntil(clients.claim());
+});