Summary: Introduce a new ScribeLogger class that spawns and maintains a process. Log messages are newline-delimited and written to the process's stdin. If the process stops responding or responds too slowly, log messages are dropped.
Reviewed By: pkaush
Differential Revision: D17777215
fbshipit-source-id: c998d10c73fc103122d69ae19c5d84f58b7939d2