Adds about:user-actions page.

chrome/browser/ui/webui/user_actions/user_actions_ui_handler.h

Index: chrome/browser/ui/webui/user_actions/user_actions_ui_handler.h
diff --git a/chrome/browser/ui/webui/user_actions/user_actions_ui_handler.h b/chrome/browser/ui/webui/user_actions/user_actions_ui_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..de145ea6e5770272670a3e3063edcc2741639351
--- /dev/null
+++ b/chrome/browser/ui/webui/user_actions/user_actions_ui_handler.h
@@ -0,0 +1,38 @@
+// Copyright 2012 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 CHROME_BROWSER_UI_WEBUI_USER_ACTIONS_USER_ACTIONS_UI_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_USER_ACTIONS_USER_ACTIONS_UI_HANDLER_H_
+
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+// UI Handler for chrome://user-actions/
+// It listens to user action notifications and passes those notifications
+// into the Javascript to update the page.
+class UserActionsUIHandler : public content::NotificationObserver,
+                             public content::WebUIMessageHandler {
+ public:
+  UserActionsUIHandler();
+  virtual ~UserActionsUIHandler();
+
+  // NotificationObserver implementation:
+  // Listens for user action notifications and passes the message to
+  // observeUserAction in user_actions.js.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // WebUIMessageHandler implementation:
+  // Does nothing for now.
+  virtual void RegisterMessages() OVERRIDE;
+
+ private:
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(UserActionsUIHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_USER_ACTIONS_USER_ACTIONS_UI_HANDLER_H_