Sign out profile when local_state file has been changed.

chrome/browser/signin/signin_util.cc

+// 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 {
+
+bool* g_is_force_signin_enabled_cache = nullptr;

[Roger Tawa OOO till Jul 10th, 2017/02/27 22:08:26]

I don't understand why this is a pointer and why it needs to be dynamically
allocated.

Instead of making this a global, why not cache it as a member of
ChromeSigninClient?

[zmin, 2017/03/07 20:06:42]

Using enum instead of pointer here.
 
Every profile has its own ChromeSigninClient while the policy value here is
global.

+
+bool IsForceSigninEnabled() {
+  if (!g_is_force_signin_enabled_cache) {
+    PrefService* prefs = g_browser_process->local_state();
+    if (prefs) {
+      g_is_force_signin_enabled_cache =
+          new bool(prefs->GetBoolean(prefs::kForceBrowserSignin));
+    } else {
+      return false;
+    }
+  }
+  return *g_is_force_signin_enabled_cache;
+}
+
+void SetForceSigninForTesting(bool enable) {
+  if (g_is_force_signin_enabled_cache)
+    *g_is_force_signin_enabled_cache = enable;
+  else
+    g_is_force_signin_enabled_cache = new bool(enable);
+}
+
+}  // namespace signin_util