Move WebUIFactory to chrome/browser.

content/browser/webui/web_ui_register.h

+// Copyright (c) 2011 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.
+
+#include "base/singleton.h"
+
+class WebUISource;
+
+// A single-entry registry which keeps track of a WebUISource. The browser
+// registers a signle WebUISource at a time.

[jam, 2011/03/24 21:38:43]

nit: single

+class WebUIRegister {

[stuartmorgan, 2011/03/24 21:09:41]

Register is usually a verb. Registry? Registrar?

Given the comment below though, this may not be the best name, as it sort of
implies a list. FactoryContainer?

[Evan Stade, 2011/03/24 21:28:40]

register is also a noun. As a noun it's basically a synonym of registry,
although I hoped that due to its use in processor land it might conjure the idea
of a place for a single value to be kept.

registrar is something that registers things for you (NotificationRegistrar
registers the observer in the NotificationService)

registry to me implies a list, as you say.

FactoryContainer sounds a little odd to me but I am open to changing the name to
whatever can be agreed upon.

+ public:
+  // Sets the WebUISource. Clears any previous source.
+  static void RegisterSource(WebUISource* source);

[stuartmorgan, 2011/03/24 21:09:41]

Maybe the behavior would be more obvious if the name were SetSource.

[Evan Stade, 2011/03/24 21:28:40]

ok

+
+  // Returns whatever WebUISource has been registered. This will never return
+  // NULL; if no WebUISource was registered it returns an EmptyWebUISource (for
+  // which no URL is considered a WebUI).
+  static const WebUISource* GetSource();
+
+  // Exists for Singleton. See Singleton implementation.
+  static WebUIRegister* GetInstance();
+
+ private:
+  WebUIRegister();
+  ~WebUIRegister();
+
+  friend struct DefaultSingletonTraits<WebUIRegister>;
+
+  // We don't own this pointer.
+  WebUISource* source_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebUIRegister);
+};