fix: chrome://accessibility not loading (#24437)

shell/browser/ui/webui/accessibility_ui.h

@@ -0,0 +1,39 @@
+// Copyright (c) 2020 Microsoft, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef SHELL_BROWSER_UI_WEBUI_ACCESSIBILITY_UI_H_
+#define SHELL_BROWSER_UI_WEBUI_ACCESSIBILITY_UI_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "chrome/browser/accessibility/accessibility_ui.h"
+#include "content/public/browser/web_ui_controller.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+// Controls the accessibility web UI page.
+class ElectronAccessibilityUI : public content::WebUIController {
+ public:
+  explicit ElectronAccessibilityUI(content::WebUI* web_ui);
+  ~ElectronAccessibilityUI() override;
+};
+
+// Manages messages sent from accessibility.js via json.
+class ElectronAccessibilityUIMessageHandler
+    : public AccessibilityUIMessageHandler {
+ public:
+  ElectronAccessibilityUIMessageHandler();
+
+  void RegisterMessages() final;
+
+ private:
+  void RequestNativeUITree(const base::ListValue* args);
+
+  DISALLOW_COPY_AND_ASSIGN(ElectronAccessibilityUIMessageHandler);
+};
+
+#endif  // SHELL_BROWSER_UI_WEBUI_ACCESSIBILITY_UI_H_