Add the streamListen and streamCancel rpcs to the vm service.

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/json.h"
 #include "vm/allocation.h"
@@ skipping 16 matching lines @@
 class Zone;
 
 
 enum JSONRpcErrorCode {
   kParseError     = -32700,
   kInvalidRequest = -32600,
   kMethodNotFound = -32601,
   kInvalidParams  = -32602,
   kInternalError  = -32603,
 
-  kVMMustBePaused    = 100,
-  kNoBreakAtLine     = 101,
-  kNoBreakAtFunction = 102,
+  // These must be kept in sync with vm/service/vmservice.dart.
+  kInvalidStream           = 100,
+  kStreamAlreadySubscribed = 101,
+  kStreamNotSubscribed     = 102,
 
-  kProfilingDisabled = 200,
+  kVMMustBePaused    = 200,
+  kNoBreakAtLine     = 201,
+  kNoBreakAtFunction = 202,
+
+  kProfilingDisabled = 300,
 };
 
 
 class JSONStream : ValueObject {
  public:
   explicit JSONStream(intptr_t buf_size = 256);
   ~JSONStream();
 
   void Setup(Zone* zone,
              Dart_Port reply_port,
@@ skipping 232 matching lines @@
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_