Flutter.framework (iOS) should be copied read-only #8681
Description
Flutter framework files (e.g. FlutterViewController.h) are copied using default umask/permissions. We should mark it as read-only as a signal that it's not user-editable code.
Perhaps this should apply to all of bin/cache?
[✓] Flutter (on Mac OS, channel unknown)
• Flutter at /Users/cbracken/src/flutter/flutter
• Framework revision f2e7c95ab3 (14 hours ago), 2017-03-08 21:22:09
• Engine revision 6e54f5e31f
• Tools Dart version 1.23.0-dev.2.0