The vm_service_integration test flake is caused by trying to call the method before the framework is initialized (and the extension added). The run errors failure is caused by the error taking some time to propagate to the harness
A frequent request from the last Flutter developer survey was for an easier method of testing light/dark mode changes. Currently, a user needs to manually change the theme settings or adjust phone settings to see the difference. Instead we should add a toggle from the CLI, and eventually devtools/Intellij/Vscode that allows developers to override the current setting.
Fixes#59495
Adds flutter.ext.brightnessOverride service protocol which either queries the current platform brightness, or overrides it to a new value. This accepts either Brightness.light or Brightness.dark as a value.
Adds a CLI toggle b which allows the setting to be toggled manually.
Requires an update to the MediaQuery, to conditionally use a debug override when not in release mode
