Introduce EmbedderHeapTracer

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 3226828c2210436afae35a0440bc489d349aa705..8257f05fbdaeb7e074e45ae3c23c45dca20ca915 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -919,11 +919,21 @@ class Heap {
   const char* GetSpaceName(int idx);
 
   // ===========================================================================
+  // API. ======================================================================
+  // ===========================================================================
+
+  void SetEmbedderHeapTracer(EmbedderHeapTracer* tracer);
+
+  void RegisterExternallyReferencedObject(Object** object);
+
+  // ===========================================================================
   // Getters to other components. ==============================================
   // ===========================================================================
 
   GCTracer* tracer() { return tracer_; }
 
+  EmbedderHeapTracer* embedder_heap_tracer() { return embedder_heap_tracer_; }

[Hannes Payer (out of office), 2016/03/31 12:31:38]

Move this one to the API section. Can you add other heap methods called from the
API on a follow up CL? As a heap.h cleanup?

+
   PromotionQueue* promotion_queue() { return &promotion_queue_; }
 
   inline Isolate* isolate();
@@ -2102,6 +2112,7 @@ class Heap {
   int deferred_counters_[v8::Isolate::kUseCounterFeatureCount];
 
   GCTracer* tracer_;
+  EmbedderHeapTracer* embedder_heap_tracer_;
 
   int high_survival_rate_period_length_;
   intptr_t promoted_objects_size_;