Track JS allocations as they arrive with no affection on performance when tracking is switched off

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 7642 matching lines @@
       GetMemorySizeUsedByProfiler();
 }
 
 
 void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
                                          RetainedObjectInfo* info) {
   reinterpret_cast<i::HeapProfiler*>(this)->SetRetainedObjectInfo(id, info);
 }
 
 
+void HeapProfiler::StartRecordingHeapAllocations() {
+  reinterpret_cast<i::HeapProfiler*>(this)->StartHeapAllocationsRecording();
+}
+
+
+void HeapProfiler::StopRecordingHeapAllocations() {
+  reinterpret_cast<i::HeapProfiler*>(this)->StopHeapAllocationsRecording();
+}
+
+
 v8::Testing::StressType internal::Testing::stress_type_ =
     v8::Testing::kStressTypeOpt;
 
 
 void Testing::SetStressRunType(Testing::StressType type) {
   internal::Testing::set_stress_type(type);
 }
 
 
 int Testing::GetStressRuns() {
@@ skipping 219 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal