stuartmorgan 983e9db4f8 [linux] Allow engine flags via environment vars (flutter/engine#21497)
Adds the ability to pass engine switches temporarily at runtime via
environment variables. Uses the same approach recently added to
Windows and macOS.

This is enabled only for debug/profile to avoid potential issues with
tampering with released applications, but if there is a need for that in
the future it could be added (potentially with a whitelist, as is
currently used for Dart VM flags).

Fixes flutter/flutter#60393
2020-10-06 11:17:19 -07:00
..