Introduce EmbedderHeapTracer

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index dea23a44f3df6e8e23496002d3bf913b48bd6c03..fc972b0f08dfd2f3e380f472c4b88ff8a5de4797 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -677,6 +677,9 @@ i::Object** V8::CopyPersistent(i::Object** obj) {
   return result.location();
 }
 
+void V8::AddObjectToMarkingDeque(i::Object** object, i::Isolate* isolate) {
+  i::GlobalHandles::AddObjectToMarkingDeque(object, isolate);

[Hannes Payer (out of office), 2016/03/31 11:13:22]

Why do you go through GlobalHandles? You could call the registration function on
heap right away.

[Marcel Hlopko, 2016/03/31 11:58:59]

Seemed like I should leave a breadcrumb in the global handles, but I agree, it's
more of a bloat. Removed.

+}
 
 void V8::MakeWeak(i::Object** object, void* parameter,
                   WeakCallback weak_callback) {
@@ -7174,6 +7177,10 @@ void V8::AddGCEpilogueCallback(GCCallback callback, GCType gc_type) {
       reinterpret_cast<v8::Isolate::GCCallback>(callback), gc_type, false);
 }
 
+void Isolate::SetEmbedderHeapTracer(EmbedderHeapTracer* tracer) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->heap()->SetEmbedderHeapTracer(tracer);
+}
 
 void Isolate::AddMemoryAllocationCallback(MemoryAllocationCallback callback,
                                           ObjectSpace space,