perf,src: add HistogramBase and internal/histogram.js

Separating this out from the QUIC PR to allow it to be separately
reviewed. The QUIC implementation makes use of the hdr_histogram
for dynamic performance monitoring. This introduces a BaseObject
class that allows the internal histograms to be accessed on the
JavaScript side and adds a generic Histogram class that will be
used by both QUIC and perf_hooks (for the event loop delay
monitoring).

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/31988
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/node_perf.h b/src/node_perf.h
index 4f5ca93f223..ac65533a772 100644
--- a/src/node_perf.h
+++ b/src/node_perf.h
@@ -161,7 +161,7 @@ class ELDHistogram : public HandleWrap, public Histogram {
     exceeds_ = 0;
     prev_ = 0;
   }
-  int64_t Exceeds() { return exceeds_; }
+  int64_t Exceeds() const { return exceeds_; }
 
   void MemoryInfo(MemoryTracker* tracker) const override {
     tracker->TrackFieldWithSize("histogram", GetMemorySize());