LibWeb: Use a precise timer for performance timestamps

Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/05c571bf9b
Pull-request: https://github.com/SerenityOS/serenity/pull/23353
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp

@@ -23,6 +23,7 @@ JS_DEFINE_ALLOCATOR(Performance);
 Performance::Performance(HTML::Window& window)
     : DOM::EventTarget(window.realm())
     , m_window(window)
+    , m_timer(Core::TimerType::Precise)
 {
     m_timer.start();
 }