Allow multiple WebUIControllerFactory objects to be registered. This makes is possible to implement…

content/browser/webui/web_ui_controller_factory_registry.h

+// Copyright (c) 2013 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 CONTENT_BROWSER_WEBUI_WEB_UI_CONTROLLER_FACTORY_REGISTRY_H_
+#define CONTENT_BROWSER_WEBUI_WEB_UI_CONTROLLER_FACTORY_REGISTRY_H_
+
+#include "base/memory/singleton.h"
+#include "content/public/browser/web_ui_controller_factory.h"
+
+namespace content {
+
+// A singleton which holds on to all the registered WebUIControllerFactory
+// instances.
+class CONTENT_EXPORT WebUIControllerFactoryRegistry
+    : public WebUIControllerFactory {
+ public:
+  static WebUIControllerFactoryRegistry* GetInstance();
+
+  static void UnregisterFactoryForTesting(WebUIControllerFactory* factory);
+
+  // WebUIControllerFactory implementation. Each method loops through the same
+  // method on all the factories.
+  virtual WebUIController* CreateWebUIControllerForURL(
+      WebUI* web_ui, const GURL& url) const OVERRIDE;
+  virtual WebUI::TypeID GetWebUIType(BrowserContext* browser_context,
+                                     const GURL& url) const OVERRIDE;
+  virtual bool UseWebUIForURL(BrowserContext* browser_context,
+                              const GURL& url) const OVERRIDE;
+  virtual bool UseWebUIBindingsForURL(BrowserContext* browser_context,
+                                      const GURL& url) const OVERRIDE;
+  virtual bool IsURLAcceptableForWebUI(BrowserContext* browser_context,
+                                       const GURL& url,
+                                       bool data_urls_allowed) const OVERRIDE;
+
+ private:
+  friend struct DefaultSingletonTraits<WebUIControllerFactoryRegistry>;
+
+  WebUIControllerFactoryRegistry();
+  virtual ~WebUIControllerFactoryRegistry();
+
+  DISALLOW_COPY_AND_ASSIGN(WebUIControllerFactoryRegistry);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_WEBUI_WEB_UI_CONTROLLER_FACTORY_REGISTRY_H_