Worker: Run appcache-worker.https.html with off-the-main-thread worker script fetch

Bug: 945673
Change-Id: I3221c73b01f19e6e8df8b472cc3ac480a6a50c4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535508
Auto-Submit: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644168}

third_party/blink/web_tests/VirtualTestSuites

@@ -625,6 +625,11 @@
     "base": "external/wpt/content-security-policy/worker-src",
     "args": ["--enable-features=OffMainThreadDedicatedWorkerScriptFetch,PlzDedicatedWorker,OffMainThreadServiceWorkerScriptFetch,OffMainThreadSharedWorkerScriptFetch"]
   },
+  {
+    "prefix": "omt-worker-fetch",
+    "base": "external/wpt/html/browsers/offline/appcache/workers/",
+    "args": ["--enable-features=OffMainThreadDedicatedWorkerScriptFetch,PlzDedicatedWorker,OffMainThreadServiceWorkerScriptFetch,OffMainThreadSharedWorkerScriptFetch"]
+  },
   {
     "prefix": "omt-worker-fetch",
     "base": "external/wpt/mixed-content/classic-data-worker-fetch",

third_party/blink/web_tests/virtual/omt-worker-fetch/external/wpt/html/browsers/offline/appcache/workers/appcache-worker.https-expected.txt

+This is a testharness.js-based test.
+FAIL Dedicated worker of the cached script assert_equals: expected "Done: cached" but got "Error: Importing a non-cached script must fail."
+FAIL Dedicated worker of the fallbacked script assert_equals: expected "Done: fallbacked" but got "Error: Importing a non-cached script must fail."
+FAIL Dedicated worker of the not-in-cache script promise_test: Unhandled rejection with value: "The worker not in the AppCache must not be executed."
+FAIL Shared worker of the cached script assert_equals: expected "Done: cached" but got "Error: Importing a non-cached script must fail."
+FAIL Shared worker of the fallbacked script assert_equals: expected "Done: fallbacked" but got "Error: Importing a non-cached script must fail."
+PASS Shared worker of the not-in-cache script
+Harness: the test ran to completion.
+