1 files changed, 34 insertions, 0 deletions
diff --git a/tools/profiler/tests/browser/serviceworkers/serviceworker_cache_first.js b/tools/profiler/tests/browser/serviceworkers/serviceworker_cache_first.js
new file mode 100644
index 0000000000..baa07fd6d8
--- /dev/null
+++ b/tools/profiler/tests/browser/serviceworkers/serviceworker_cache_first.js
@@ -0,0 +1,34 @@
+const files = ["serviceworker_page.html", "firefox-logo-nightly.svg"];
+const cacheName = "v1";
+
+self.addEventListener("install", event => {
+  performance.mark("__serviceworker_event");
+  console.log("[SW]:", "Install event");
+
+  event.waitUntil(cacheAssets());
+});
+
+async function cacheAssets() {
+  const cache = await caches.open(cacheName);
+  await cache.addAll(files);
+}
+
+self.addEventListener("fetch", event => {
+  performance.mark("__serviceworker_event");
+  console.log("Handling fetch event for", event.request.url);
+  event.respondWith(handleFetch(event.request));
+});
+
+async function handleFetch(request) {
+  const cachedResponse = await caches.match(request);
+  if (cachedResponse) {
+    console.log("Found response in cache:", cachedResponse);
+
+    return cachedResponse;
+  }
+  console.log("No response found in cache. About to fetch from network...");
+
+  const networkResponse = await fetch(request);
+  console.log("Response from network is:", networkResponse);
+  return networkResponse;
+}