Upstream most of the iOS WebUI support in ios/web/

ios/public/provider/web/web_ui_ios_controller_factory.h

+// Copyright 2014 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.
+
+#ifndef IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_CONTROLLER_FACTORY_H_
+#define IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_CONTROLLER_FACTORY_H_
+
+#include "ios/public/provider/web/web_ui_ios.h"
+
+class GURL;
+
+namespace web {
+
+class WebUIIOSController;
+
+// Interface for an object that controls which URLs are considered WebUIIOS
+// URLs and creates WebUIIOSController instances for given URLs.
+class WebUIIOSControllerFactory {
+ public:
+  virtual ~WebUIIOSControllerFactory() {}
+
+  // Call to register a factory.
+  static void RegisterFactory(WebUIIOSControllerFactory* factory);
+
+  // Returns a WebUIIOSController instance for the given URL, or NULL if the URL
+  // doesn't correspond to a WebUIIOS.
+  virtual WebUIIOSController* CreateWebUIIOSControllerForURL(
+      WebUIIOS* web_ui,
+      const GURL& url) const = 0;
+};
+
+}  // namespace web
+
+#endif  // IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_CONTROLLER_FACTORY_H_