10414 expose max depth on Window

10419 Make kernel compiler use host toolchain

10423 Fix mac gen_snapshot uploader

10430 Add copy_gen_snapshots.py tool

10477 Add #else, #endif condition comments

10479 Delete unused create_macos_gen_snapshot.py script

10485 Remove semi-redundant try-jobs.

10629 Fix engine platformviewscontroller leak

10637 Document the thread test fixture.

10644 [flutter_runner] Port: Add connectToService, wrapping fdio_ns_connect.

10652 Allow embedders to control Dart VM lifecycle on engine shutdown.