Enable PIN configuration settings.

chrome/browser/ui/webui/settings/chromeos/quick_unlock_handler.cc

Index: chrome/browser/ui/webui/settings/chromeos/quick_unlock_handler.cc
diff --git a/chrome/browser/ui/webui/settings/chromeos/quick_unlock_handler.cc b/chrome/browser/ui/webui/settings/chromeos/quick_unlock_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d0796d901fe51c80706eec63e43d7b5ba491cd61
--- /dev/null
+++ b/chrome/browser/ui/webui/settings/chromeos/quick_unlock_handler.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/ui/webui/settings/chromeos/quick_unlock_handler.h"
+
+#include "base/feature_list.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
+#include "chrome/common/chrome_features.h"
+#include "chromeos/chromeos_switches.h"
+#include "content/public/browser/web_ui_data_source.h"
+
+namespace {
+
+static bool IsQuickUnlockAllowed() {
+  // Disable quick unlock if the machine is enterprise managed.
+  // TODO(jdufault): This should only be disabled if specified by policy.
+  if (g_browser_process->platform_part()
+          ->browser_policy_connector_chromeos()
+          ->IsEnterpriseManaged()) {
+    return false;
+  }
+
+  // Enable quick unlock only if the switch is present.
+  return base::FeatureList::IsEnabled(features::kQuickUnlockPin);
+}
+
+}  // namespace
+
+namespace settings {
+
+void InitializeQuickUnlockForSettings(content::WebUIDataSource* html_source) {
+  html_source->AddBoolean("quickUnlockAllowed", IsQuickUnlockAllowed());

[Dan Beam, 2016/07/22 01:22:28]

why is it better to have this key ("quickUnlockAllowed") here?  why not just
inline this statement from the calling side?

[jdufault, 2016/07/22 19:15:50]

I've inlined the html_source->AddBoolean into md_settings_ui.cc and pulled
IsQuickUnlockEnabled into a new file quick_unlock_utils.h/cc that is also used
by PinStorage.

+}
+
+}  // namespace settings