Provide stdout and stderr output in the Observatory debugger.

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_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 55 matching lines @@
 
   // Handles a message which is directed to a particular isolate.
   static void HandleIsolateMessage(Isolate* isolate, const Array& message);
 
   static bool NeedsIsolateEvents() { return needs_isolate_events_; }
   static bool NeedsDebugEvents() { return needs_debug_events_; }
   static bool NeedsGCEvents() { return needs_gc_events_; }
   static bool NeedsEchoEvents() { return needs_echo_events_; }
   static bool NeedsGraphEvents() { return needs_graph_events_; }
 
-  static void ListenStream(const char* stream_id);
+  static bool ListenStream(const char* stream_id);
   static void CancelStream(const char* stream_id);
 
   static void HandleEvent(ServiceEvent* event);
 
   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 SetEmbedderStreamCallbacks(
+      Dart_ServiceStreamListenCallback listen_callback,
+      Dart_ServiceStreamCancelCallback cancel_callback);
+
   static void SendEchoEvent(Isolate* isolate, const char* text);
   static void SendGraphEvent(Isolate* isolate);
   static void SendInspectEvent(Isolate* isolate, const Object& inspectee);
 
+  static void SendEmbedderEvent(Isolate* isolate,
+                                const char* stream_id,
+                                const char* event_kind,
+                                const uint8_t* bytes,
+                                intptr_t bytes_len);
+
+  static Dart_ServiceStreamListenCallback stream_listen_callback() {
+    return stream_listen_callback_;
+  }
+  static Dart_ServiceStreamCancelCallback stream_cancel_callback() {
+    return stream_cancel_callback_;
+  }
+
+  // Well-known stream ids.
+  static const char* const kIsolateStreamId;
+  static const char* const kDebugStreamId;
+  static const char* const kGCStreamId;
+  static const char* const kEchoStreamId;
+  static const char* const kGraphStreamId;
+
  private:
   static void InvokeMethod(Isolate* isolate, const Array& message);
 
   static void EmbedderHandleMessage(EmbedderServiceHandler* handler,
                                     JSONStream* js);
 
   static EmbedderServiceHandler* FindIsolateEmbedderHandler(const char* name);
   static EmbedderServiceHandler* FindRootEmbedderHandler(const char* name);
 
   static void SendEvent(const char* stream_id,
                         const char* event_type,
                         const Object& eventMessage);
   // Does not take ownership of 'data'.
   static void SendEventWithData(const char* stream_id,
                                 const char* event_type,
                                 const String& meta,
                                 const uint8_t* data,
                                 intptr_t size);
 
   static EmbedderServiceHandler* isolate_service_handler_head_;
   static EmbedderServiceHandler* root_service_handler_head_;
+  static Dart_ServiceStreamListenCallback stream_listen_callback_;
+  static Dart_ServiceStreamCancelCallback stream_cancel_callback_;
 
   static bool needs_isolate_events_;
   static bool needs_debug_events_;
   static bool needs_gc_events_;
   static bool needs_echo_events_;
   static bool needs_graph_events_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_