2nd attempt at adding streamListen/streamCancel to the service protocol.

runtime/vm/heap.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/heap.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
 #include "vm/isolate.h"
@@ skipping 602 matching lines @@
     new_space_->AddGCTime(delta);
     new_space_->IncrementCollections();
   } else {
     old_space_->AddGCTime(delta);
     old_space_->IncrementCollections();
   }
   stats_.after_.new_ = new_space_->GetCurrentUsage();
   stats_.after_.old_ = old_space_->GetCurrentUsage();
   ASSERT(gc_in_progress_);
   gc_in_progress_ = false;
-  if (Service::NeedsEvents()) {
+  if (Service::NeedsGCEvents()) {
     ServiceEvent event(Isolate::Current(), ServiceEvent::kGC);
     event.set_gc_stats(&stats_);
     Service::HandleEvent(&event);
   }
 }
 
 
 void Heap::PrintStats() {
   if (!FLAG_verbose_gc) return;
 
@@ skipping 67 matching lines @@
     heap->DisableGrowthControl();
 }
 
 
 NoHeapGrowthControlScope::~NoHeapGrowthControlScope() {
     Heap* heap = reinterpret_cast<Isolate*>(isolate())->heap();
     heap->SetGrowthControlState(current_growth_controller_state_);
 }
 
 }  // namespace dart