Add FingerprintUnlock KeyedService for each profile

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

Index: chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.h
diff --git a/chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.h b/chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.h
new file mode 100644
index 0000000000000000000000000000000000000000..ce1507b28360409de1170ca9ca3dc4730e402c10
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+++ b/chrome/browser/chromeos/login/quick_unlock/fingerprint_storage.h
@@ -0,0 +1,56 @@
+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_FINGERPRINT_STORAGE_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_FINGERPRINT_STORAGE_H_
+
+#include "base/time/time.h"
+
+class PrefService;
+
+namespace chromeos {
+
+class FingerprintStorageTestApi;
+
+namespace quick_unlock {
+
+class QuickUnlockStorage;
+
+class FingerprintStorage {
+ public:
+  static const int kMaximumUnlockAttempts = 5;
+
+  explicit FingerprintStorage(PrefService* pref_service);
+  ~FingerprintStorage();
+
+  // Returns true if the user has fingerprint enrollments registered.
+  bool HasEnrollment() const;
+
+  // Add a fingerprint unlock attempt count.
+  void AddUnlockAttempt();
+
+  // Reset the number of unlock attempts to 0.
+  void ResetUnlockAttemptCount();
+
+  int unlock_attempt_count() const { return unlock_attempt_count_; }
+
+ private:
+  friend class chromeos::FingerprintStorageTestApi;
+  friend class QuickUnlockStorage;
+
+  // Returns true if fingerprint unlock is currently available.
+  bool IsFingerprintAuthenticationAvailable() const;
+
+  PrefService* pref_service_;
+  // Number of fingerprint unlock attempt.
+  int unlock_attempt_count_ = 0;
+  bool has_enrollments_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(FingerprintStorage);
+};
+
+}  // namespace quick_unlock
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_FINGERPRINT_STORAGE_H_