Sign out profile when local_state file has been changed.

chrome/browser/signin/signin_util.cc

Index: chrome/browser/signin/signin_util.cc
diff --git a/chrome/browser/signin/signin_util.cc b/chrome/browser/signin/signin_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e5f50790d59abb40fdccbdbbb99d5a2e8743efe1
--- /dev/null
+++ b/chrome/browser/signin/signin_util.cc
@@ -0,0 +1,41 @@
+// 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_util.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+
+namespace signin_util {
+namespace {
+
+enum ForceSigninPolicyCache {
+  NOT_CACHED = 0,
+  ENABLE,
+  DISABLE
+} g_is_force_signin_enabled_cache = NOT_CACHED;
+
+void SetForceSigninPolicy(bool enable) {
+  g_is_force_signin_enabled_cache = enable ? ENABLE : DISABLE;
+}
+
+}  // namespace
+
+bool IsForceSigninEnabled() {
+  if (g_is_force_signin_enabled_cache == NOT_CACHED) {
+    PrefService* prefs = g_browser_process->local_state();
+    if (prefs)
+      SetForceSigninPolicy(prefs->GetBoolean(prefs::kForceBrowserSignin));
+    else
+      return false;
+  }
+  return (g_is_force_signin_enabled_cache == ENABLE);
+}
+
+void SetForceSigninForTesting(bool enable) {
+  SetForceSigninPolicy(enable);
+}
+
+}  // namespace signin_util