Update web-platform-tests to revision 077bb422b7bb21491a414e334bc594d83ca9e55b

tests/wpt/web-platform-tests/signed-exchange/resources/sxg-util.js

@@ -0,0 +1,36 @@
+// Opens |url| in an iframe, establish a message channel with it, and waits for
+// a message from the frame content. Returns a promise that resolves with the
+// data of the message, or rejects on 2000ms timeout.
+function openSXGInIframeAndWaitForMessage(test_object, url) {
+  return new Promise(async (resolve, reject) => {
+    // We can't catch the network error on iframe. So we use the timer.
+    test_object.step_timeout(() => reject('timeout'), 2000);
+
+    const frame = await withIframe(url, 'sxg_iframe');
+    const channel = new MessageChannel();
+    channel.port1.onmessage = (event) => resolve(event.data);
+    frame.contentWindow.postMessage(
+        {port: channel.port2}, '*', [channel.port2]);
+  });
+}
+
+function withIframe(url, name) {
+  return new Promise((resolve, reject) => {
+      const frame = document.createElement('iframe');
+      frame.src = url;
+      frame.name = name;
+      frame.onload = () => resolve(frame);
+      frame.onerror = () => reject('failed to load ' + url);
+      document.body.appendChild(frame);
+    });
+}
+
+function loadScript(url) {
+  return new Promise((resolve, reject) => {
+    const scriptTag = document.createElement('script');
+    scriptTag.src = url;
+    scriptTag.onload = () => resolve();
+    scriptTag.onerror = () => reject('failed to load ' + url);
+    document.head.appendChild(scriptTag);
+  });
+}