Async-step, first cut.

runtime/vm/service_event.h

 // Copyright (c) 2015, 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_EVENT_H_
 #define VM_SERVICE_EVENT_H_
 
 #include "vm/debugger.h"
 
 class DebuggerEvent;
@@ skipping 27 matching lines @@
   };
 
   ServiceEvent(Isolate* isolate, EventKind event_kind)
       : isolate_(isolate),
         kind_(event_kind),
         embedder_kind_(NULL),
         embedder_stream_id_(NULL),
         breakpoint_(NULL),
         top_frame_(NULL),
         exception_(NULL),
+        async_continuation_(NULL),
         inspectee_(NULL),
         gc_stats_(NULL),
         bytes_(NULL),
         bytes_length_(0) {}
 
   explicit ServiceEvent(const DebuggerEvent* debugger_event);
 
   Isolate* isolate() const { return isolate_; }
 
   EventKind kind() const { return kind_; }
@@ skipping 35 matching lines @@
   }
 
   const Object* exception() const {
     return exception_;
   }
   void set_exception(const Object* exception) {
     ASSERT(kind_ == kPauseException);
     exception_ = exception;
   }
 
+  const Object* async_continuation() const {
+    return async_continuation_;
+  }
+  void set_async_continuation(const Object* closure) {
+    ASSERT(kind_ == kPauseBreakpoint);
+    async_continuation_ = closure;
+  }
+
   const Object* inspectee() const {
     return inspectee_;
   }
   void set_inspectee(const Object* inspectee) {
     ASSERT(kind_ == kInspect);
     inspectee_ = inspectee;
   }
 
   const Heap::GCStats* gc_stats() const {
     return gc_stats_;
@@ skipping 19 matching lines @@
   void PrintJSON(JSONStream* js) const;
 
  private:
   Isolate* isolate_;
   EventKind kind_;
   const char* embedder_kind_;
   const char* embedder_stream_id_;
   Breakpoint* breakpoint_;
   ActivationFrame* top_frame_;
   const Object* exception_;
+  const Object* async_continuation_;
   const Object* inspectee_;
   const Heap::GCStats* gc_stats_;
   const uint8_t* bytes_;
   intptr_t bytes_length_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_EVENT_H_