Initial checkin of gRPC to third_party/

third_party/grpc/examples/ruby/lib/helloworld_services.rb

+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# Source: helloworld.proto for package 'helloworld'
+
+require 'grpc'
+require 'helloworld'
+
+module Helloworld
+  module Greeter
+
+    # TODO: add proto service documentation here
+    class Service
+
+      include GRPC::GenericService
+
+      self.marshal_class_method = :encode
+      self.unmarshal_class_method = :decode
+      self.service_name = 'helloworld.Greeter'
+
+      rpc :SayHello, HelloRequest, HelloReply
+    end
+
+    Stub = Service.rpc_stub_class
+  end
+end