Add VMService GC events

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"
 
 namespace dart {
 
 class DebuggerEvent;
+class GCEvent;
 class EmbedderServiceHandler;
 class Instance;
 class Isolate;
 class JSONStream;
 class Array;
 class RawInstance;
 class String;
 
 class Service : public AllStatic {
  public:
@@ skipping 10 matching lines @@
   static bool IsRunning() {
     return port_ != ILLEGAL_PORT;
   }
 
   static void SetEventMask(uint32_t mask);
 
   // Is the service interested in debugger events?
   static bool NeedsDebuggerEvents() {
     return IsRunning() && ((event_mask_ & kEventFamilyDebugMask) != 0);
   }
+  // Is the service interested in garbage collection events?
+  static bool NeedsGCEvents() {
+    return IsRunning() && ((event_mask_ & kEventFamilyGCMask) != 0);
+  }
 
   static void HandleDebuggerEvent(DebuggerEvent* event);
+  static void HandleGCEvent(GCEvent* 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 bool IsServiceIsolate(Isolate* isolate) {
     return isolate == service_isolate_;
   }
 
  private:
   // These must be kept in sync with service/constants.dart
   static const int kEventFamilyDebug = 0;
+  static const int kEventFamilyGC = 1;
   static const uint32_t kEventFamilyDebugMask = (1 << kEventFamilyDebug);
+  static const uint32_t kEventFamilyGCMask = (1 << kEventFamilyGC);
 
   static void EmbedderHandleMessage(EmbedderServiceHandler* handler,
                                     JSONStream* js);
   static EmbedderServiceHandler* FindIsolateEmbedderHandler(const char* name);
   static EmbedderServiceHandler* FindRootEmbedderHandler(const char* name);
   static Dart_Handle GetSource(const char* name);
   static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag, Dart_Handle library,
                                        Dart_Handle url);
   static void SendEvent(intptr_t eventId, const String& eventMessage);
 
   static EmbedderServiceHandler* isolate_service_handler_head_;
   static EmbedderServiceHandler* root_service_handler_head_;
 
   static Isolate* service_isolate_;
   static Dart_LibraryTagHandler embedder_provided_handler_;
   static Dart_Port port_;
   static uint32_t event_mask_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_