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

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 32a3db643c950cdc8c7be0ce28d259d73ddb9a5b..469c7a1814df85e35e1e409684be5c22efa3437c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7300,6 +7300,16 @@ void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
 }
 
 
+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;