Add addFiberRemote

Summary: Complete support of the FiberManager::addTask*

Reviewed By: pranavtbhat

Differential Revision: D22305146

fbshipit-source-id: 94e4a02f754b306d8b5fe4994832a7e2dc2cf4a5

folly/fibers/async/FiberManager.h

@@ -47,6 +47,16 @@ void addFiber(F&& func, FiberManager& fm) {
       [func = std::forward<F>(func)]() mutable { return init_await(func()); });
 }
 
+/**
+ * Schedule an async-annotated functor to run on a remote thread's
+ * fiber manager.
+ */
+template <typename F>
+void addFiberRemote(F&& func, FiberManager& fm) {
+  fm.addTaskRemote(
+      [func = std::forward<F>(func)]() mutable { return init_await(func()); });
+}
+
 /**
  * Schedule an async-annotated functor to run on a fiber manager.
  * Returns a Future for the result.