common/prpc, tools/cmd/cproto: prpc client

common/prpc/helloworld_test.proto

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 syntax = "proto3";
 
-package test;
-
-// The greeting service definition.
-service Greeter {
-  // Sends a greeting
-  rpc SayHello (HelloRequest) returns (HelloReply) {}
-}
+package prpc;
 
 // The request message containing the user's name.
 message HelloRequest {
   string name = 1;
 }
 
 // The response message containing the greetings
 message HelloReply {
   string message = 1;
 }