Show the current logged-in username on the NTP.

BUG=58024
TEST=included, for manual test sign into sync then go to NTP

Review URL: http://codereview.chromium.org/3784004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@62933 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 42 insertions, 0 deletions

diff --git a/chrome/browser/dom_ui/ntp_login_handler.h b/chrome/browser/dom_ui/ntp_login_handler.h
new file mode 100644
index 0000000..d6eabfe
--- /dev/null
+++ b/chrome/browser/dom_ui/ntp_login_handler.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2010 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_DOM_UI_NTP_LOGIN_HANDLER_H_
+#define CHROME_BROWSER_DOM_UI_NTP_LOGIN_HANDLER_H_
+#pragma once
+
+#include "chrome/browser/dom_ui/dom_ui.h"
+#include "chrome/browser/prefs/pref_member.h"
+#include "chrome/common/notification_observer.h"
+
+// The NTP login handler currently simply displays the current logged in
+// username at the top of the NTP (and update itself when that changes).
+// In the future it may expand to allow users to login from the NTP.
+class NTPLoginHandler : public DOMMessageHandler,
+                        public NotificationObserver {
+ public:
+  NTPLoginHandler();
+  ~NTPLoginHandler();
+
+  virtual DOMMessageHandler* Attach(DOMUI* dom_ui);
+
+  // DOMMessageHandler interface
+  virtual void RegisterMessages();
+
+  // NotificationObserver interface
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+ private:
+  // Called from JS when the NTP is loaded.
+  void HandleInitializeLogin(const ListValue* args);
+
+  // Internal helper method
+  void UpdateLogin();
+
+  StringPrefMember username_pref_;
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_NTP_LOGIN_HANDLER_H_