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 415bd41bb19496036f3bda9a6c78ac55ec033ecd..e2d3fa658b1920e46de199e91cd49eb09319c9d9 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7660,6 +7660,16 @@ 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;