Return an error in many service RPCs if the isolate is not runnable

runtime/vm/json_stream.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_JSON_STREAM_H_
 #define VM_JSON_STREAM_H_
 
 #include "include/dart_api.h"  // for Dart_Port
 #include "platform/text_buffer.h"
 #include "vm/allocation.h"
@@ skipping 32 matching lines @@
   kInvalidParams  = -32602,
   kInternalError  = -32603,
 
   kExtensionError = -32000,
 
   kFeatureDisabled         = 100,
   kVMMustBePaused          = 101,
   kCannotAddBreakpoint     = 102,
   kStreamAlreadySubscribed = 103,
   kStreamNotSubscribed     = 104,
+  kIsolateMustBeRunnable   = 105,
 };
 
 
 class JSONStream : ValueObject {
  public:
   explicit JSONStream(intptr_t buf_size = 256);
   ~JSONStream();
 
   void Setup(Zone* zone,
              Dart_Port reply_port,
@@ skipping 313 matching lines @@
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_