[Reland] Refactoring of SBER preference usage

components/safe_browsing_db/safe_browsing_prefs.h

+// Copyright (c) 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.
+//
+// Safe Browsing preferences and some basic utility functions for using them.
+
+#ifndef COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_PREFS_H_
+#define COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_PREFS_H_
+
+class PrefService;
+
+namespace prefs {
+extern const char kSafeBrowsingExtendedReportingEnabled[];
+}
+
+namespace safe_browsing {
+
+// Returns the name of the Safe Browsing Extended Reporting pref that is
+// currently in effect. The specific pref in-use may change through experiments.
+const char* GetExtendedReportingPrefName();
+
+// Returns whether Safe Browsing Extended Reporting is currently enabled.
+// This should be used to decide if any of the reporting preferences are set,
+// regardless of which specific one is set.
+bool IsExtendedReportingEnabled(const PrefService& prefs);
+
+// Updates UMA metrics about Safe Browsing Extended Reporting states.
+void RecordExtendedReportingMetrics(const PrefService& prefs);
+
+}  // namespace safe_browsing
+
+#endif  // COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_PREFS_H_