SharedWorker: Add ES module SharedWorker for WorkerInBackgroundPage

This CL adds browser tests for 'module' type shared workers in
WorkerTest.WorkerInBackgroundPage.

Bug: 824646
Change-Id: I4500087be534bb384bcf4171437b50312b2a7da1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2061578Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Eriko Kurimoto <elkurin@google.com>
Cr-Commit-Position: refs/heads/master@{#743451}

chrome/test/data/extensions/api_test/worker/background.js

@@ -83,6 +83,10 @@ chrome.test.getConfig(function(config) {
       undefined,
       () => { return new SharedWorker(sharedWorkerUrl) },
       sharedWorkerUrl),
+    noRedirectTest.bind(
+      undefined,
+      () => { return new SharedWorker(sharedWorkerUrl, {type: 'module'}) },
+      sharedWorkerUrl),
 
     sameOriginRedirectTest.bind(
       undefined,
@@ -96,6 +100,12 @@ chrome.test.getConfig(function(config) {
       undefined,
       () => { return new SharedWorker(redirectedSharedWorkerUrl) },
       sharedWorkerUrl),
+    sameOriginRedirectTest.bind(
+      undefined,
+      () => {
+        return new SharedWorker(redirectedSharedWorkerUrl, {type: 'module'});
+      },
+      sharedWorkerUrl),
 
     crossOriginRedirectTest.bind(
       undefined,
@@ -108,5 +118,11 @@ chrome.test.getConfig(function(config) {
     crossOriginRedirectTest.bind(
       undefined,
       () => { return new SharedWorker(crossOriginRedirectedSharedWorkerUrl) }),
+    crossOriginRedirectTest.bind(
+      undefined,
+      () => {
+        return new SharedWorker(crossOriginRedirectedSharedWorkerUrl,
+                                {type: 'module'});
+      }),
   ]);
 });