Port _echo, etc commands to RPC

runtime/vm/service.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SERVICE_H_
 #define VM_SERVICE_H_
 
 #include "include/dart_api.h"
 
 #include "vm/allocation.h"
@@ skipping 56 matching lines @@
   static void RegisterIsolateEmbedderCallback(
       const char* name,
       Dart_ServiceRequestCallback callback,
       void* user_data);
 
   static void RegisterRootEmbedderCallback(
       const char* name,
       Dart_ServiceRequestCallback callback,
       void* user_data);
 
-  static void SendEchoEvent(Isolate* isolate);
+  static void SendEchoEvent(Isolate* isolate, const char* text);
   static void SendGraphEvent(Isolate* isolate);
 
   static void MaybeInjectVMServiceLibrary(Isolate* isolate);
 
   static void RunService();
 
   static void FinishedInitializing();
 
   static Dart_IsolateCreateCallback create_callback() {
     return create_callback_;
@@ skipping 31 matching lines @@
   static bool initializing_;
   static Isolate* service_isolate_;
   static Dart_Port service_port_;
   static Dart_Port load_port_;
   static uint32_t event_mask_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_