Disable websocket compression on service port (dart-lang/coverage#258)

This disables websocket compression when connecting to the VM service
port. Since almost all invocations of coverage collection tools happen
over a loopback connection to localhost, websocket compression uses a
ton of CPU, which causes a performance hit rather than a performance
benefit.
2 files changed
tree: 7bc2a5995172830e47d9e4c0d9f1b14d4e8d480a
  1. pkgs/