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 eb2ffcff18094e3e3b2fe37c4a1dbe7276ea9e97..df9118421ebcb6d6e60d1471c0be668b4378e84d 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7915,6 +7915,16 @@ 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;