LibWeb: Introduce Performance Timeline and its Performance functions

Author: https://github.com/Lubrsi
Commit: 31b507afbf
Pull-request: https://github.com/SerenityOS/serenity/pull/18013
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibWeb/HighResolutionTime/Performance.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2023, Luke Wilde <lukew@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -22,6 +23,10 @@ public:
 
     JS::GCPtr<NavigationTiming::PerformanceTiming> timing();
 
+    WebIDL::ExceptionOr<Vector<JS::Handle<PerformanceTimeline::PerformanceEntry>>> get_entries() const;
+    WebIDL::ExceptionOr<Vector<JS::Handle<PerformanceTimeline::PerformanceEntry>>> get_entries_by_type(String const& type) const;
+    WebIDL::ExceptionOr<Vector<JS::Handle<PerformanceTimeline::PerformanceEntry>>> get_entries_by_name(String const& name, Optional<String> type) const;
+
 private:
     explicit Performance(HTML::Window&);