Update web-platform-tests to revision 60220357131c65146444da1f54624d5b54d0975d

tests/wpt/web-platform-tests/web-locks/resources/helpers.js

@@ -0,0 +1,60 @@
+// Test helpers used by multiple Web Locks API tests.
+(() => {
+
+  // Generate a unique resource identifier, using the script path and
+  // test case name. This is useful to avoid lock interference between
+  // test cases.
+  let res_num = 0;
+  self.uniqueName = testCase => {
+    return `${self.location.pathname}-${testCase.name}-${++res_num}`;
+  };
+
+  // Inject an iframe showing the given url into the page, and resolve
+  // the returned promise when the frame is loaded.
+  self.iframe = url => new Promise(resolve => {
+    const element = document.createElement('iframe');
+    element.addEventListener(
+      'load', () => { resolve(element); }, { once: true });
+    element.src = url;
+    document.documentElement.appendChild(element);
+  });
+
+  // Post a message to the target frame, and resolve the returned
+  // promise when a response comes back. The posted data is annotated
+  // with unique id to track the response. This assumes the use of
+  // 'iframe.html' as the frame, which implements this protocol.
+  let next_request_id = 0;
+  self.postToFrameAndWait = (frame, data) => {
+    const iframe_window = frame.contentWindow;
+    data.rqid = next_request_id++;
+    iframe_window.postMessage(data, '*');
+    return new Promise(resolve => {
+      const listener = event => {
+        if (event.source !== iframe_window || event.data.rqid !== data.rqid)
+          return;
+        self.removeEventListener('message', listener);
+        resolve(event.data);
+      };
+      self.addEventListener('message', listener);
+    });
+  };
+
+  // Post a message to the target worker, and resolve the returned
+  // promise when a response comes back. The posted data is annotated
+  // with unique id to track the response. This assumes the use of
+  // 'worker.js' as the worker, which implements this protocol.
+  self.postToWorkerAndWait = (worker, data) => {
+    return new Promise(resolve => {
+      data.rqid = next_request_id++;
+      worker.postMessage(data);
+      const listener = event => {
+        if (event.data.rqid !== data.rqid)
+          return;
+        worker.removeEventListener('message', listener);
+        resolve(event.data);
+      };
+      worker.addEventListener('message', listener);
+    });
+  };
+
+})();