feat: add serial api support (#25237)

* feat: add serial api support

resolves #22478

* Put serial port support behind a flag and mark as experimental

* Update docs/api/session.md

Co-authored-by: Jeremy Rose <jeremya@chromium.org>

* Use enable-blink-features=Serial instead of enable-experimental-web-platform-features

* Set enableBlinkFeatures on webPreferences instead of commandline

Co-authored-by: Jeremy Rose <jeremya@chromium.org>

shell/browser/serial/serial_chooser_context_factory.cc

@@ -0,0 +1,41 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "shell/browser/serial/serial_chooser_context_factory.h"
+
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "shell/browser/serial/serial_chooser_context.h"
+
+namespace electron {
+
+SerialChooserContextFactory::SerialChooserContextFactory()
+    : BrowserContextKeyedServiceFactory(
+          "SerialChooserContext",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+SerialChooserContextFactory::~SerialChooserContextFactory() {}
+
+KeyedService* SerialChooserContextFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new SerialChooserContext();
+}
+
+// static
+SerialChooserContextFactory* SerialChooserContextFactory::GetInstance() {
+  return base::Singleton<SerialChooserContextFactory>::get();
+}
+
+// static
+SerialChooserContext* SerialChooserContextFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<SerialChooserContext*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+content::BrowserContext* SerialChooserContextFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return context;
+}
+
+}  // namespace electron