fix: service worker registration with custom protocols

patches/chromium/.patches

@@ -109,3 +109,4 @@ build_make_libcxx_abi_unstable_false_for_electron.patch
 introduce_ozoneplatform_electron_can_call_x11_property.patch
 make_gtk_getlibgtk_public.patch
 build_disable_print_content_analysis.patch
+custom_protocols_plzserviceworker.patch

patches/chromium/custom_protocols_plzserviceworker.patch

@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: deepak1556 <hop2deep@gmail.com>
+Date: Fri, 20 May 2022 00:29:34 +0900
+Subject: custom_protocols_plzserviceworker.patch
+
+Allow registering custom protocols to handle service worker main script fetching with PlzServiceWorker.
+
+Refs https://bugs.chromium.org/p/chromium/issues/detail?id=996511
+
+diff --git a/content/browser/service_worker/service_worker_context_wrapper.cc b/content/browser/service_worker/service_worker_context_wrapper.cc
+index 9aba6deb9e11ec2803f163088d1c321dd256787f..1dc24bb4c83acd2ff618b085059c918261b2a3d4 100644
+--- a/content/browser/service_worker/service_worker_context_wrapper.cc
++++ b/content/browser/service_worker/service_worker_context_wrapper.cc
+@@ -1616,6 +1616,28 @@ ServiceWorkerContextWrapper::GetLoaderFactoryForBrowserInitiatedRequest(
+       loader_factory_bundle_info =
+           context()->loader_factory_bundle_for_update_check()->Clone();
+
++  // Give the embedder a chance to register custom schemes that can
++  // handle loading the service worker main script.
++  // Previous registration triggered by
++  // ServiceWorkerContextWrapper::CreateNonNetworkPendingURLLoaderFactoryBundleForUpdateCheck
++  // happens early on browser startup before the JS in the main process
++  // is run by the embedder.
++  auto* factory_bundle = static_cast<blink::PendingURLLoaderFactoryBundle*>(
++          loader_factory_bundle_info.get());
++  ContentBrowserClient::NonNetworkURLLoaderFactoryMap non_network_factories;
++  GetContentClient()
++      ->browser()
++      ->RegisterNonNetworkServiceWorkerUpdateURLLoaderFactories(
++          storage_partition_->browser_context(), &non_network_factories);
++  for (auto& pair : non_network_factories) {
++    const std::string& scheme = pair.first;
++    mojo::PendingRemote<network::mojom::URLLoaderFactory>& factory_remote =
++        pair.second;
++
++    factory_bundle->pending_scheme_specific_factories().emplace(
++        scheme, std::move(factory_remote));
++  }
++
+   if (base::FeatureList::IsEnabled(
+           features::kEnableServiceWorkersForChromeUntrusted) &&
+       scope.scheme_piece() == kChromeUIUntrustedScheme) {
+@@ -1636,9 +1658,7 @@ ServiceWorkerContextWrapper::GetLoaderFactoryForBrowserInitiatedRequest(
+             browser_context(), scope_origin)) {
+       config->RegisterURLDataSource(browser_context());
+
+-      static_cast<blink::PendingURLLoaderFactoryBundle*>(
+-          loader_factory_bundle_info.get())
+-          ->pending_scheme_specific_factories()
++      factory_bundle->pending_scheme_specific_factories()
+           .emplace(kChromeUIUntrustedScheme,
+                    CreateWebUIServiceWorkerLoaderFactory(
+                        browser_context(), kChromeUIUntrustedScheme,

shell/browser/electron_browser_client.cc

@@ -1328,6 +1328,11 @@ void ElectronBrowserClient::
   DCHECK(browser_context);
   DCHECK(factories);
 
+  auto* protocol_registry =
+      ProtocolRegistry::FromBrowserContext(browser_context);
+  protocol_registry->RegisterURLLoaderFactories(factories,
+                                                false /* allow_file_access */);
+
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   factories->emplace(
       extensions::kExtensionScheme,

spec-main/api-protocol-spec.ts

@@ -764,10 +764,7 @@ describe('protocol module', () => {
       await expect(contents.executeJavaScript(`navigator.serviceWorker.register('${v4()}.notjs', {scope: './'})`)).to.be.rejected();
     });
 
-    // TODO(nornagon): I'm not sure why this isn't working, but I'm choosing to
-    // disable this test for now to land the roll. See
-    // https://github.com/electron/electron/issues/32664.
-    it.skip('should be able to register service worker for custom scheme', async () => {
+    it('should be able to register service worker for custom scheme', async () => {
       await contents.loadURL(`${serviceWorkerScheme}://${v4()}.com`);
       await contents.executeJavaScript(`navigator.serviceWorker.register('${v4()}.js', {scope: './'})`);
     });