CPU Profiler Updates

Added functionality to load an app startup profile for Flutter apps.
This profile will contain CPU samples from the initialization
of the Dart VM up until the first Flutter frame has been rendered. -
#3357

When the app startup profile has been loaded,
you will see that the “AppStartUp” user tag is selected for the profile.
You can also load the app startup profile
by selecting this user tag filter, when present,
in the list of available user tags.

Added multi-isolate support.
Select which isolate you want to profile
from the isolate selector at the bottom of the page. -
#3362

Add class names to CPU stack frames in the profiler -
#3385

Changelog

More details about changes and fixes are available in our changelog.