Introduce a way to grab heap stats.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6219 matching lines @@
       break;
     default:
       UNREACHABLE();
   }
   return reinterpret_cast<const HeapSnapshot*>(
       i::HeapProfiler::TakeSnapshot(
           *Utils::OpenHandle(*title), internal_type, control));
 }
 
 
+void HeapProfiler::StartHeapObjectsTracking() {
+  i::Isolate* isolate = i::Isolate::Current();
+  IsDeadCheck(isolate, "v8::HeapProfiler::StartHeapObjectsTracking");
+  i::HeapProfiler::StartHeapObjectsTracking();
+}
+
+
+void HeapProfiler::StopHeapObjectsTracking() {
+  i::Isolate* isolate = i::Isolate::Current();
+  IsDeadCheck(isolate, "v8::HeapProfiler::StopHeapObjectsTracking");
+  i::HeapProfiler::StopHeapObjectsTracking();
+}
+
+
+void HeapProfiler::PushHeapObjectsStats(OutputStream* stream) {
+  i::Isolate* isolate = i::Isolate::Current();
+  IsDeadCheck(isolate, "v8::HeapProfiler::PushHeapObjectsStats");
+  return i::HeapProfiler::PushHeapObjectsStats(stream);
+}
+
+
 void HeapProfiler::DeleteAllSnapshots() {
   i::Isolate* isolate = i::Isolate::Current();
   IsDeadCheck(isolate, "v8::HeapProfiler::DeleteAllSnapshots");
   i::HeapProfiler::DeleteAllSnapshots();
 }
 
 
 void HeapProfiler::DefineWrapperClass(uint16_t class_id,
                                       WrapperInfoCallback callback) {
   i::Isolate::Current()->heap_profiler()->DefineWrapperClass(class_id,
@@ skipping 129 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* scope_implementer =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   scope_implementer->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal