Split NTPLoginHandler across chrome://apps and chrome://history.

chrome/browser/ui/webui/history_login_handler.cc

Index: chrome/browser/ui/webui/history_login_handler.cc
diff --git a/chrome/browser/ui/webui/history_login_handler.cc b/chrome/browser/ui/webui/history_login_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..55b83a9f0e64cfb2333b00599a9460421b36d0d1
--- /dev/null
+++ b/chrome/browser/ui/webui/history_login_handler.cc
@@ -0,0 +1,37 @@
+// Copyright 2015 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/history_login_handler.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/profile_info_watcher.h"
+#include "content/public/browser/web_ui.h"
+
+HistoryLoginHandler::HistoryLoginHandler() {}
+HistoryLoginHandler::~HistoryLoginHandler() {}
+
+void HistoryLoginHandler::RegisterMessages() {
+  profile_info_watcher_.reset(new ProfileInfoWatcher(
+      Profile::FromWebUI(web_ui()),
+      base::Bind(&HistoryLoginHandler::ProfileInfoChanged,
+                 base::Unretained(this))));
+
+  web_ui()->RegisterMessageCallback("otherDevicesInitialized",
+      base::Bind(&HistoryLoginHandler::HandleOtherDevicesInitialized,
+                 base::Unretained(this)));
+}
+
+void HistoryLoginHandler::HandleOtherDevicesInitialized(
+    const base::ListValue* /*args*/) {
+  ProfileInfoChanged();
+}
+
+void HistoryLoginHandler::ProfileInfoChanged() {
+  bool signed_in = !profile_info_watcher_->GetAuthenticatedUsername().empty();
+  web_ui()->CallJavascriptFunction(
+      "updateSignInState", base::FundamentalValue(signed_in));
+}