devtools

3bf3eb30 - Show Performance and CPU Profiler screens without app connection (#6567)

Show Performance and CPU Profiler screens without app connection (#6567) * Add Performance and CPU Profiler screens to list of statically available screens * add OpenSaveButtonGroup * release notes and changelog * dart doc * Update packages/devtools_app/lib/src/screens/performance/performance_screen.dart Co-authored-by: Daniel Chevalier <danchevalier@google.com> --------- Co-authored-by: Daniel Chevalier <danchevalier@google.com>