This library provides an implementation of fit::executor that integrates with async_dispatcher_t.
This code really belongs in Zircon but we are currently unable to compile it there due to its use of the C++ standard library. So for now it lives in Garnet although it largely adheres to Zircon styles, etc. Once the C++ standard library is supported in Zircon we will move the code into libasync-cpp where it really belongs.