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

chrome/browser/ui/webui/profile_info_watcher.cc

Index: chrome/browser/ui/webui/profile_info_watcher.cc
diff --git a/chrome/browser/ui/webui/profile_info_watcher.cc b/chrome/browser/ui/webui/profile_info_watcher.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a85ea12b4a16a0031e67ff08d8dd35c9abe3008e
--- /dev/null
+++ b/chrome/browser/ui/webui/profile_info_watcher.cc
@@ -0,0 +1,60 @@
+// 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/profile_info_watcher.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_info_cache.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
+#include "chrome/common/pref_names.h"
+#include "components/signin/core/browser/signin_manager.h"
+
+ProfileInfoWatcher::ProfileInfoWatcher(
+    Profile* profile, const base::Closure& callback)
+    : profile_(profile), callback_(callback) {
+  DCHECK(profile_);
+  DCHECK(!callback_.is_null());
+
+  ProfileManager* profile_manager = g_browser_process->profile_manager();
+  // The profile_manager might be NULL in testing environments.
+  if (profile_manager)
+    profile_manager->GetProfileInfoCache().AddObserver(this);
+
+  signin_allowed_pref_.Init(prefs::kSigninAllowed, profile_->GetPrefs(),
+      base::Bind(&ProfileInfoWatcher::RunCallback, base::Unretained(this)));
+}
+
+ProfileInfoWatcher::~ProfileInfoWatcher() {
+  ProfileManager* profile_manager = g_browser_process->profile_manager();
+  // The profile_manager might be NULL in testing environments.
+  if (profile_manager)
+    profile_manager->GetProfileInfoCache().RemoveObserver(this);
+}
+
+void ProfileInfoWatcher::OnProfileAuthInfoChanged(
+    const base::FilePath& profile_path) {
+  RunCallback();
+}
+
+std::string ProfileInfoWatcher::GetAuthenticatedUsername() const {
+  std::string username;
+  SigninManagerBase* signin_manager = GetSigninManager();
+  if (signin_manager)
+    username = signin_manager->GetAuthenticatedUsername();
+  return username;
+}
+
+SigninManagerBase* ProfileInfoWatcher::GetSigninManager() const {
+  return SigninManagerFactory::GetForProfile(profile_);
+}
+
+void ProfileInfoWatcher::RunCallback() {
+  if (GetSigninManager())
+    callback_.Run();
+}