Refactor tests for sandbox iframes controlled by service worker

This patch is to split sandboxed-iframe-fetch-event.https.html into small
chunks. Each promise_test has smaller number of assertions, so that now we can
see the results for each situation.

Bug: 771815
Change-Id: I75cdd67f92bbb07d6b538b209e1f0819752c3bc8
Reviewed-on: https://chromium-review.googlesource.com/923901
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537606}

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/sandboxed-iframe-fetch-event-iframe.html

 <script>
 function with_iframe(url) {
-  return new Promise(function(resolve) {
-      var frame = document.createElement('iframe');
+  return new Promise(resolve => {
+    let frame = document.createElement('iframe');
     frame.src = url;
-      frame.onload = function() { resolve(frame); };
+    frame.onload = () => { resolve(frame); };
     document.body.appendChild(frame);
   });
 }
 
 function with_sandboxed_iframe(url, sandbox) {
-  return new Promise(function(resolve) {
-      var frame = document.createElement('iframe');
+  return new Promise(resolve => {
+    let frame = document.createElement('iframe');
     frame.sandbox = sandbox;
     frame.src = url;
-      frame.onload = function() { resolve(frame); };
+    frame.onload = () => { resolve(frame); };
     document.body.appendChild(frame);
   });
 }
 
-function fetch_in_worker() {
-  return new Promise((resolve) => {
-    var blob = new Blob([
-      "fetch('" + location.href + "_workerfetch', {mode: 'no-cors'})" +
+function fetch_from_worker(url) {
+  return new Promise(resolve => {
+    let blob = new Blob([
+      `fetch('${url}', {mode: 'no-cors'})` +
       "  .then(() => { self.postMessage('OK'); });"]);
-    var url = URL.createObjectURL(blob);
-    var worker = new Worker(url);
+    let worker_url = URL.createObjectURL(blob);
+    let worker = new Worker(worker_url);
     worker.onmessage = resolve;
   });
 }
 
-window.onmessage = function (e) {
-  var id = e.data['id'];
-  fetch(location.href + "_fetch", {mode: 'no-cors'})
-    .then(function() {
-        return fetch_in_worker();
-      })
-    .then(function() {
-        return with_iframe(location.href + "_iframe");
-      })
-    .then(function() {
-        return with_sandboxed_iframe(location.href + "_script",
+function run_test(type) {
+  const base_path = location.href;
+  switch (type) {
+    case 'fetch':
+      return fetch(`${base_path}&test=fetch`, {mode: 'no-cors'});
+    case 'fetch-from-worker':
+      return fetch_from_worker(`${base_path}&test=fetch-from-worker`);
+    case 'iframe':
+      return with_iframe(`${base_path}&test=iframe`);
+    case 'sandboxed-iframe':
+      return with_sandboxed_iframe(`${base_path}&test=sandboxed-iframe`,
                                    "allow-scripts");
-      })
-    .then(function() {
-        return with_sandboxed_iframe(location.href + "_script-origin",
+    case 'sandboxed-iframe-same-origin':
+      return with_sandboxed_iframe(
+        `${base_path}&test=sandboxed-iframe-same-origin`,
         "allow-scripts allow-same-origin");
-      })
-    .then(function() {
+    default:
+      return Promise.reject(`Unknown type: ${type}`);
+  }
+}
+
+window.onmessage = event => {
+  let id = event.data['id'];
+  run_test(event.data['type'])
+    .then(() => {
       window.top.postMessage({id: id, result: 'done'}, '*');
     })
-    .catch(function(e) {
+    .catch(e => {
       window.top.postMessage({id: id, result: 'error: ' + e.toString()}, '*');
     });
 };

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/sandboxed-iframe-fetch-event-iframe.py

+import os.path
+
+def main(request, response):
+  header = [('Content-Type', 'text/html')]
+  if 'test' in request.GET:
+    with open(os.path.join(os.path.dirname(__file__),'blank.html'), 'r') as f:
+      body = f.read()
+    return (header, body)
+
+  with open(os.path.join(os.path.dirname(__file__),
+                         'sandboxed-iframe-fetch-event-iframe.html'), 'r') as f:
+    body = f.read()
+  return (header, body)

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/sandboxed-iframe-fetch-event-worker.js

@@ -10,6 +10,7 @@ self.addEventListener('message', function(event) {
           client_urls = client_urls.sort();
           event.data.port.postMessage(
               {clients: client_urls, requests: requests});
+          requests = [];
         }));
   });