Upstream chrome://flags & chrome://ui-alternatives iOS WebUI.

ios/chrome/browser/ui/webui/flags_ui.h

Index: ios/chrome/browser/ui/webui/flags_ui.h
diff --git a/ios/chrome/browser/ui/webui/crashes_ui.h b/ios/chrome/browser/ui/webui/flags_ui.h
similarity index 32%
copy from ios/chrome/browser/ui/webui/crashes_ui.h
copy to ios/chrome/browser/ui/webui/flags_ui.h
index b0605a148c9bda08dc28b015d5fd828c5aa106f4..b8c96c55e88b4203c2dd09cfb1bda420d3c0e25a 100644
--- a/ios/chrome/browser/ui/webui/crashes_ui.h
+++ b/ios/chrome/browser/ui/webui/flags_ui.h
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef IOS_CHROME_BROWSER_UI_WEBUI_CRASHES_UI_H_
-#define IOS_CHROME_BROWSER_UI_WEBUI_CRASHES_UI_H_
+#ifndef IOS_CHROME_BROWSER_UI_WEBUI_FLAGS_UI_H_
+#define IOS_CHROME_BROWSER_UI_WEBUI_FLAGS_UI_H_
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "ios/public/provider/web/web_ui_ios_controller.h"
 #include "ui/base/layout.h"
 
@@ -13,19 +14,43 @@ namespace base {
 class RefCountedMemory;
 }
 
-namespace web {
-class WebUIIOS;
-}
-
-class CrashesUI : public web::WebUIIOSController {
+class BaseFlagsUI : public web::WebUIIOSController {
  public:
-  explicit CrashesUI(web::WebUIIOS* web_ui);
+  enum FlagsUIKind {
+    FLAGS_UI_GENERIC,
+    FLAGS_UI_APPLE,
+  };
+
+  BaseFlagsUI(web::WebUIIOS* web_ui, FlagsUIKind flags_ui_kind);
+  ~BaseFlagsUI() override;
 
   static base::RefCountedMemory* GetFaviconResourceBytes(
       ui::ScaleFactor scale_factor);
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(CrashesUI);
+  void Initialize(web::WebUIIOS* web_ui, FlagsUIKind flags_ui_kind);
+
+  base::WeakPtrFactory<BaseFlagsUI> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BaseFlagsUI);
+};
+
+class FlagsUI : public BaseFlagsUI {
+ public:
+  explicit FlagsUI(web::WebUIIOS* web_ui);
+  ~FlagsUI() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FlagsUI);
+};
+
+class AppleFlagsUI : public BaseFlagsUI {
+ public:
+  explicit AppleFlagsUI(web::WebUIIOS* web_ui);
+  ~AppleFlagsUI() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppleFlagsUI);
 };
 
-#endif  // CHROME_BROWSER_UI_WEBUI_CRASHES_UI_H_
+#endif  // IOS_CHROME_BROWSER_UI_WEBUI_FLAGS_UI_H_