Dan Field 9f9ab34867 [Impeller] Log non-default graphics backend usages, use IMPORTANT rather than ERROR (flutter/engine#50448)
Fixes https://github.com/flutter/flutter/issues/142488

- Only logs on iOS if Skia is used instead of Impeller.
- Logs on other platforms if Impeller is used instead of Skia.
- Uses "IMPORTANT" rather than "ERROR" for these logs. This will show up by default since flutter_tools sets ERROR and above as logs to show.
- Adds some tests.
- Makes INFO log print file paths the same as other verbosities.
2024-02-07 21:29:12 +00:00
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