Add FingerprintUnlock KeyedService for each profile

chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.cc

Index: chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.cc
diff --git a/chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.cc b/chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8639f2f8e4817986cfb71a15d6af176f0113b7e2
--- /dev/null
+++ b/chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.cc
@@ -0,0 +1,39 @@
+// Copyright 2017 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/fingerprint_storage.h"
+
+#include "chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.h"
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+
+namespace chromeos {
+namespace quick_unlock {
+
+FingerprintStorage::FingerprintStorage(PrefService* pref_service)
+    : pref_service_(pref_service) {}
+
+FingerprintStorage::~FingerprintStorage() {}
+
+bool FingerprintStorage::IsFingerprintAuthenticationAvailable() const {
+  const bool exceeded_unlock_attempts =
+      unlock_attempt_count() >= kMaximumUnlockAttempts;
+
+  return IsFingerprintEnabled() && HasEnrollment() && !exceeded_unlock_attempts;
+}
+
+bool FingerprintStorage::HasEnrollment() const {
+  return has_enrollments_;
+}
+
+void FingerprintStorage::AddUnlockAttempt() {
+  ++unlock_attempt_count_;
+}
+
+void FingerprintStorage::ResetUnlockAttemptCount() {
+  unlock_attempt_count_ = 0;
+}
+
+}  // namespace quick_unlock
+}  // namespace chromeos