cros: Add PinStorageProvider enum which describes pin backend in use.

chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.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/chromeos/login/quick_unlock/quick_unlock_utils.h"
 
 #include "base/feature_list.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/user_manager/user_manager.h"
 
 namespace chromeos {
 namespace quick_unlock {
 
 namespace {
+// Quick unlock is enabled regardless of flags.
 bool enable_for_testing_ = false;
+// If testing is enabled, PIN will use prefs as backend. Otherwise, it will use
+// cryptohome.
+PinStorageType testing_pin_storage_type_ = PinStorageType::kPrefs;
+
 // Options for the quick unlock whitelist.
 const char kQuickUnlockWhitelistOptionAll[] = "all";
 const char kQuickUnlockWhitelistOptionPin[] = "PIN";
 // Default minimum PIN length. Policy can increase or decrease this value.
 constexpr int kDefaultMinimumPinLength = 6;
 }  // namespace
 
 base::TimeDelta PasswordConfirmationFrequencyToTimeDelta(
     PasswordConfirmationFrequency frequency) {
   switch (frequency) {
@@ skipping 48 matching lines @@
   // TODO(jdufault): Disable PIN for supervised users until we allow the owner
   // to set the PIN. See crbug.com/632797.
   user_manager::User* user = user_manager::UserManager::Get()->GetActiveUser();
   if (user && user->IsSupervised())
     return false;
 
   // Enable quick unlock only if the switch is present.
   return base::FeatureList::IsEnabled(features::kQuickUnlockPin);
 }
 
+PinStorageType GetPinStorageType() {
+  if (enable_for_testing_)
+    return testing_pin_storage_type_;
+
+  if (base::FeatureList::IsEnabled(features::kQuickUnlockPinSignin))
+    return PinStorageType::kCryptohome;
+  return PinStorageType::kPrefs;
+}
+
 bool IsFingerprintEnabled() {
   if (enable_for_testing_)
     return true;
 
   // Enable fingerprint unlock only if the switch is present.
   return base::FeatureList::IsEnabled(features::kQuickUnlockFingerprint);
 }
 
-void EnableForTesting() {
+void EnableForTesting(PinStorageType pin_storage_type) {
   enable_for_testing_ = true;
+  testing_pin_storage_type_ = pin_storage_type;
 }
 
 }  // namespace quick_unlock
 }  // namespace chromeos