Support <script type="webbundle"> in preload scanner

This makes PreloadScanner update its ExclusionInfo when it encounters
<script type="webbundle">, so that resources listed in it will not be
preloaded.

Bug: 1263777
Change-Id: Ifec5616cb27b382408023a249a274b5a0ef35da4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3244924
Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/main@{#935308}

web-bundle/resources/test-helpers.js

@@ -159,11 +159,13 @@ function createWebBundleElement(url, resources, options) {
   const script = document.createElement("script");
   script.type = "webbundle";
   const json_rule  = {"source": url, "resources": resources};
+  if (options && options.scopes) {
+    json_rule.scopes = options.scopes;
+  }
   if (options && options.credentials) {
     json_rule.credentials = options.credentials;
   }
   script.textContent = JSON.stringify(json_rule);
-  // TODO(crbug.com/1245166): Support |options.scopes|.
   return script;
 }
 

web-bundle/subresource-loading/script-relative-url-with-base.https.tentative.html

@@ -16,7 +16,7 @@
 
   <script type="webbundle">
     {
-      "source": "dynamic1.wbn"
+      "source": "dynamic1.wbn",
       "scopes": ["dynamic/resource"]
     }
   </script>