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

ios/public/provider/web/web_ui_ios_controller.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_H_
+#define IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_CONTROLLER_H_
+
+#include "base/basictypes.h"
+#include "base/strings/string16.h"
+
+class GURL;
+
+namespace base {
+class ListValue;
+}
+
+namespace web {
+
+class WebUIIOS;
+
+// A WebUIIOS page is controlled by the embedder's WebUIIOSController object. It
+// manages the data source and message handlers.
+class WebUIIOSController {
+ public:
+  explicit WebUIIOSController(WebUIIOS* web_ui) : web_ui_(web_ui) {}
+  virtual ~WebUIIOSController() {}
+
+  // Allows the controller to override handling all messages from the page.
+  // Return true if the message handling was overridden.
+  virtual bool OverrideHandleWebUIIOSMessage(const GURL& source_url,
+                                             const std::string& message,
+                                             const base::ListValue& args);
+
+  WebUIIOS* web_ui() const { return web_ui_; }
+
+ private:
+  WebUIIOS* web_ui_;
+};
+
+}  // namespace web
+
+#endif  // IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_CONTROLLER_H_