Adds about:user-actions page.

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

+// 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.
+
+#include "chrome/browser/ui/webui/user_actions/user_actions_ui_handler.h"
+
+#include "base/logging.h"
+#include "base/values.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_source.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/web_ui.h"
+
+UserActionsUIHandler::UserActionsUIHandler() : NotificationObserver() {
+  registrar_.Add(this,
+                 content::NOTIFICATION_USER_ACTION,
+                 content::NotificationService::AllSources());
+}
+
+UserActionsUIHandler::~UserActionsUIHandler() {
+}
+
+void UserActionsUIHandler::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK_EQ(type, content::NOTIFICATION_USER_ACTION);
+  base::StringValue user_action_name(
+      *content::Details<const char*>(details).ptr());
+  web_ui()->CallJavascriptFunction("userActions.observeUserAction",
+                                   user_action_name);
+}
+
+void UserActionsUIHandler::RegisterMessages() {}