1 files changed, 48 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/user-activation/resources/utils.js b/testing/web-platform/tests/html/user-activation/resources/utils.js
new file mode 100644
index 0000000000..5d3302583f
--- /dev/null
+++ b/testing/web-platform/tests/html/user-activation/resources/utils.js
@@ -0,0 +1,48 @@
+function delayByFrames(f, num_frames) {
+  function recurse(depth) {
+    if (depth == 0)
+      f();
+    else
+      requestAnimationFrame(() => recurse(depth-1));
+  }
+  recurse(num_frames);
+}
+
+// Returns a Promise which is resolved with the event object when the event is
+// fired.
+function getEvent(eventType) {
+  return new Promise(resolve => {
+    document.body.addEventListener(eventType, e => resolve(e), {once: true});
+  });
+}
+
+
+// Returns a Promise which is resolved with a "true" iff transient activation
+// was available and successfully consumed.
+//
+// This function relies on Fullscreen API to check/consume user activation
+// state.
+async function consumeTransientActivation() {
+  try {
+    await document.body.requestFullscreen();
+    await document.exitFullscreen();
+    return true;
+  } catch(e) {
+    return false;
+  }
+}
+
+function receiveMessage(type) {
+  return new Promise((resolve) => {
+    window.addEventListener("message", function listener(event) {
+      if (typeof event.data !== "string") {
+        return;
+      }
+      const data = JSON.parse(event.data);
+      if (data.type === type) {
+        window.removeEventListener("message", listener);
+        resolve(data);
+      }
+    });
+  });
+}