[Autofill] Add support for signin promo on Android

chrome/browser/signin/signin_promo_util.cc

Index: chrome/browser/signin/signin_promo_util.cc
diff --git a/chrome/browser/signin/signin_promo_util.cc b/chrome/browser/signin/signin_promo_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ba55a8a247cd19be1955ba3db8a07fc12822fb4e
--- /dev/null
+++ b/chrome/browser/signin/signin_promo_util.cc
@@ -0,0 +1,37 @@
+// Copyright 2016 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/signin/signin_promo_util.h"
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
+#include "components/signin/core/browser/signin_manager.h"
+#include "net/base/network_change_notifier.h"
+
+namespace signin {
+
+bool ShouldShowPromo(Profile* profile) {
+#if defined(OS_CHROMEOS)
+  // There's no need to show the sign in promo on cros since cros users are
+  // already logged in.
+  return false;
+#else
+
+  // Don't bother if we don't have any kind of network connection.
+  if (net::NetworkChangeNotifier::IsOffline())
+    return false;
+
+  // Don't show for supervised profiles.
+  if (profile->IsSupervised())
+    return false;
+
+  // Display the signin promo if the user is not signed in.
+  SigninManager* signin =
+      SigninManagerFactory::GetForProfile(profile->GetOriginalProfile());
+  return !signin->AuthInProgress() && signin->IsSigninAllowed() &&
+         !signin->IsAuthenticated();
+#endif
+}
+
+}  // namespace signin