Add an interface for an embedder to provide information about native

src/heap-profiler.cc

Index: src/heap-profiler.cc
diff --git a/src/heap-profiler.cc b/src/heap-profiler.cc
index 07b631fa7332d8de6bc1b50f6987aae4d74e58cd..3e2756a29065618871c39d970e8783f7826e381b 100644
--- a/src/heap-profiler.cc
+++ b/src/heap-profiler.cc
@@ -364,6 +364,26 @@ HeapSnapshot* HeapProfiler::TakeSnapshot(String* name,
 }
 
 
+void HeapProfiler::DefineWrapperClass(
+    uint16_t class_id, v8::HeapProfiler::WrapperInfoCallback callback) {
+  ASSERT(singleton_ != NULL);
+  if (singleton_->wrapper_callbacks_.length() <= class_id) {
+    singleton_->wrapper_callbacks_.AddBlock(
+        NULL, class_id - singleton_->wrapper_callbacks_.length() + 1);
+  }
+  singleton_->wrapper_callbacks_[class_id] = callback;
+}
+
+
+v8::RetainedObjectInfo* HeapProfiler::ExecuteWrapperClassCallback(
+    uint16_t class_id, Object** wrapper) {
+  ASSERT(singleton_ != NULL);
+  if (singleton_->wrapper_callbacks_.length() <= class_id) return NULL;
+  return singleton_->wrapper_callbacks_[class_id](
+      class_id, Utils::ToLocal(Handle<Object>(wrapper)));
+}
+
+
 HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name,
                                              int type,
                                              v8::ActivityControl* control) {